# RoadMap - User Manual and README

October 2007

# Contents

  1 INTRODUCTION
  2 AUTHORS
  3 ABOUT THIS DOCUMENTATION
  4 INSTALLATION
    4.1 DEPENDENCIES
    4.2 WINDOWS-SPECIFIC DEPENDENCIES AND LIMITATIONS
    4.3 DIRECTORIES
      4.3.1 EXECUTABLE FILES
      4.3.2 CONFIGURATION FILES
      4.3.3 ICON FILES
      4.3.4 MAP FILES
    4.4 DOWNLOADING ROADMAP
    4.5 INSTALLING FROM THE FAMILIAR PACKAGE
    4.6 INSTALLING FROM THE SOURCE TARBALL (UNIX)
    4.7 INSTALLING FROM THE SOURCE TARBALL (WINDOWS CE)
    4.8 CROSS COMPILING FOR THE FAMILIAR TARGET
    4.9 A NOTE ABOUT THE ROADMAP ICONS
    4.10 TROUBLESHOOTING THE INSTALLATION
  5 ROADMAP APPLICATIONS
  6 USING ROADMAP
    6.1 COMMAND LINE OPTIONS
    6.2 GETTING HELP
    6.3 THE ROADMAP DISPLAY
    6.4 USING THE MOUSE OR PEN
    6.5 VOICE INTERFACE
    6.6 KEY BINDINGS
    6.7 ON-THE-FLY MAP DOWNLOAD
    6.8 WAYPOINTS AND ADDRESSES
    6.9 STREET NAME OPTIONS
    6.10 OTHER ADDRESS OPTIONS
    6.11 SELECTING AN INTERSECTION
    6.12 SELECTING A POSITION
    6.13 MANAGING TRIPS
      6.13.1 Creating a route:
      6.13.2 Converting a track to a route:
      6.13.3 Importing a route:
      6.13.4 Quick Destination:
      6.13.5 Following a route:
    6.14 CURRENT TRACK
    6.15 DRIVERS
    6.16 ROADMAP PREFERENCES
  7 USING ROADGPS
  8 CONFIGURATION
    8.1 FILES
    8.2 CLASS FILES AND SKINS
    8.3 CONFIGURING THE TEXT AND VOICE MESSAGES
    8.4 CONFIGURING THE MENUS AND TOOLBAR
    8.5 CONFIGURING ON-SCREEN OBJECTS
    8.6 A NOTE REGARDING COLORS
    8.7 PREFERENCE ITEMS
    8.8 SESSION ITEMS
    8.9 SCHEMA ITEMS
    8.10 SPRITES FILE
    8.11 TRIP FILES
    8.12 FEATURE FILES
  9 TOOLS
  10 CONFIGURATION EXAMPLES
  11 IMPLEMENTATION DETAILS
    11.1 PORTING ROADMAP
    11.2 PROJECTION
  12 WRITING A ROADMAP DRIVER
    12.1 OVERVIEW
    12.2 DRIVER COMMANDS
    12.3 ROADMAP RESPONSES
  13 MAP FORMAT
    13.1 MAP FILES AND INDEXES
    13.2 CLASS FILES
    13.3 TABLES
    13.4 THE STRING SECTION
    13.5 DIRECTORY TABLES
    13.6 MAP TABLES
    13.7 THE SQUARE SECTION
    13.8 THE POINT SECTION
    13.9 THE LINE SECTION
    13.10 THE SHAPE SECTION
    13.11 THE POLYGON SECTION
    13.12 THE STREET SECTION
    13.13 THE RANGE SECTION
    13.14 THE EXCHANGE FORMAT

# 1 INTRODUCTION

RoadMap is an open source program for UNIX that displays street maps. When a GPS receiver is available RoadMap can track the current location of the vehicle on the screen, continuously adjusting the position of the map; it can also identify the name of the current street as well as the name of the next intersection. RoadMap can be used without a GPS receiver, as a static map viewer and address finder.

Most of the maps are provided by the US Census Bureau, which only cover the US. RoadMap now includes a preliminary support for two other formats: the Digital Charts of the Words (DCW), a set of world-wide maps produced by the US Department of Defense, and the Canadian RNF (Road Network File) maps. The DCW contains only major highways and freeways, for some parts or the world (mostly Europe and japan) and their accuracy does not allow any reliable car navigation. The RNF files contain road data, but currently no water features or municipality information.

RoadMap is released under the GPL (see the COPYING file). The US Census Bureau's data is public domain. The DCW data is mostly public domain, but some administrative boundary data is copyright of ESRI (http://www.esri.com/). As no administrative data is incorporated in the RoadMap map files, all the RoadMap map files are in the public domain.

RoadMap uses a binary file format for representing the maps that is compact enough to allow the storage of many maps on a Compact Flash or MultiMedia card. The map of Los Angeles county takes a little more than 10 Mbytes of flash space. RoadMap comes with a set of tools to convert the US Census bureau data into its own map format.

RoadMap has been designed to be usable on both a desktop or laptop computer, or on a PDA such as the iPAQ from HP (formely from COMPAQ) or the Sharp Zaurus.

In its current version, RoadMap can work with either the GTK+ 1.2, GTK 2.0, GPE, QT/X11 or QT/QPE graphic environments. The QT environment --especially its QT/QPE version--is mostly used for the Zaurus port (but could probably be used with OPIE). RoadMap is configured for using QT3 by default, but the QT2 compatibility headers must be installed (the QT2-style coding has been kept because of the Zaurus QPE environment). The most stable environment is the GTK 2.0 one (this is the one used for developing RoadMap). The GPE support is and optional extension of the GTK 2.0 environment and is still very experimental (i.e. untested). GTK 1.2 is still interesting because it's quite a bit more efficient when running on limited hardware than is GTK 2.0.

RoadMap is also available on Windows CE (i.e. Pocket PC). As gpsd does not exist on Windows, the Windows version directly listens to the GPS serial port.

RoadMap is at an early stage of development. At this time all the features have not been implemented yet. RoadMap can display the map around a specified street address, track a GPS position and identify the current street and the next intersection. Trip support is provided (waypoints, route following, and general landmarks). Large sets of "Point of Interest" features also can be displayed on the map.

The plan for the future is to implement some navigation features similar to those found in commercial car navigation systems, and to port RoadMap to as many environment as possible.

# 2 AUTHORS

This document, as well as RoadMap as a whole, is primarily the work of Pascal Martin. Other major contributors include Steve Woodbridge, Ehud Shabtai, and Paul Fox.

# 3 ABOUT THIS DOCUMENTATION

This documentation was written using vi (what else? :-) in the format supported by aptconvert. The aptconvert tool was used to produce the HTML version of this manual (file web/manual.html). The HTML file can be regenerated using the following command:

          aptconvert -toc web/manual.html README

The aptconvert tool is available at http://www.xmlmind.com/aptconvert.html.

# 4 INSTALLATION

## 4.1 DEPENDENCIES

- GPS and gpsd

  RoadMap communicates with a GPS receiver using the NMEA 0183 protocol. RoadMap has been tested with a Garmin 38. The GPS receiver must be configured with the datum set to either NAD83 or WGS 84.

  RoadMap can connect directly to the GPS receiver using a serial port (or an emulated serial port in the case of USB receivers), but RoadMap usually communicates with the GPS receiver through gpsd, a GPS communication daemon for UNIX. Going through the intermediate daemon insulates RoadMap from some of the GPS configuration, and lets more than one program (namely RoadMap and RoadGps) use the GPS device at once. It also allows RoadMap to use a GPS device which is connected to a different computer. The most typical setup is to have gpsd on the same computer, in which case the GPS source should be set as "gpsd://localhost".

  http://gpsd.berlios.de

  gpsd is not required when building RoadMap, and RoadMap can run without gpsd as a static map viewer or address finder.

- Desktop toolkit

  RoadMap usually uses one flavor or another of GTK or QT for its user interface. One of these toolkits must be installed. RoadMap can be built for QT/QPE, but the RoadMap makefile for QT must be modified.

- Voice support

  RoadMap optionally uses flite (festival lite) to generate voice messages. See section "VOICE INTERFACE" for more information.

- Optional libraries

  RoadMap uses the expat library to load GPX trip and landmark files. RoadMap can be built without expat, with some loss of functionality, by changing config.mk to say: EXPAT = NO. (On Debian or Ubuntu linux systems, use "apt-get install libexpat1-dev" to install the expat library.)

  Likewise, RoadMap can sometimes use the agg library to render anti- aliased maps and street label text. If you don't have agg, RoadMap will label with a (relatively crude) built-in font. To use agg: AGG = YES. RoadMap requires version 2.4 of the agg library -- 2.3 is incompatible. If your linux distribution includes 2.3, make sure that if you install 2.4 as well, that RoadMap finds both headers and libraries from 2.4. Note: currently (as of August, 2006) the agg support is only aavailable if you're using the GTK2 build of roadmap. (On Debian or Ubuntu linux systems, use "apt-get install libagg-dev" to install the agg library.)

  The "buildmap" program uses the shapelib library to decode the "shapefile" format). Currently, most of the maps used by RoadMap are not in that format, but some are: Canadian provinces, state boundaries, and the Digital Charts of the World. If only US maps from the census bureau are used, or if only pre-built maps are used, then there is no need for shapelib: set SHAPEFILES = NO in config.mk. (On Debian or Ubuntu linux systems, use "apt-get install libshp-dev" to install the shapefile library.)

  Likewise, the popt library is needed for building "buildmap". It is not needed for building or running RoadMap itself. Set POPT = NO to prevent buildmap (and buildus) from being built. ("apt-get install libpopt-dev" on Debian or Ubuntu.)

- Miscellaneous

  RoadMap uses "aptconvert" to format the documentation (see previous section) into HTML format. Since this is an uncommon tool, a pre-converted copy of manual.html is provided in the RoadMap tarball.

  RoadMap can use the "convert" program from the ImageMagick package to generate the PNG versions of some of the icons on its toolbar. Pre-built copies of these PNG files are distributed, so ImageMagick is optional, and in any case is only required for building RoadMap, it is not necessary when running RoadMap.

## 4.2 WINDOWS-SPECIFIC DEPENDENCIES AND LIMITATIONS

The port of RoadMap on Windows is recent, not fully complete and has not been tested thoroughly, so problems are to be expected. Thank you for your understanding.

The port to Windows was implemented by Ehud Shabtai (eshabtai@gmail.com).

RoadMap is only available for PocketPC 2002 and later at that time. There is no support yet for Windows XP, 2000 or 2003. This is because the WIN32 API is not the same on all Windows platforms: to the extend of our knowledge, RoadMap might not compile, and should not run, on Windows XP.

RoadMap use the WIN32 API exclusively, and no specific graphic library is required.

There is UNIX Makefile support for building the WinCE version of RoadMap using the arm-wince-mingw32ce cross-compiler toolchain, available from http://cegcc.sourceforge.net, but support in the code for the toolchain is incomplete. Working versions have all come from real Microsoft tools.

Maps cannot be built under Windows (buildmap and buildus have not been ported yet). Maps built under Linux can be used on PocketPC systems, however.

The flite software is available under Windows: a PocketPC 2002 (ARM) binary is available on the RoadMap project's SourceForge web site. The flite.exe binary must be installed in the same folder as the roadmap.exe binary.

The gpsd software is not available on Windows. Note that network access to a remote gpsd is possible (the remote computer must run UNIX).

Instead of a local gpsd, RoadMap can uses a Windows serial port and the GPS source should then be specified as "COM1:", "COM2":, etc...

The roadmap and roadgps programs cannot run simultaneously when configured for the serial port. The "GPS Console" menu item of roadmap does not work in that configuration.

Only NMEA-capable GPS devices are supported, unless a remote gpsd is used.

Downloading maps on the fly is not available on Windows, due to the lack of gzip and tar tools on PocketPC.

The screenshots feature of RoadMap is not available on Windows or GTK

The full-screen mode of RoadMap is not available on Windows or GTK.

## 4.3 DIRECTORIES

RoadMap is to be installed in a few different directories, where each directory contains a specific type of file: commands, configuration files, icons and maps.

Before you install RoadMap, you must choose what installation directories to use for these files. Some of these choices are already made for you when you install a pre-built package (such as the Familiar ipk package), or are assigned default values in the makefiles (source package). This section describes the whole thing, regardless of how you install RoadMap. It also provides some information about the standard locations in the most common cases.

RoadMap supports lists of directories, instead of a single location, for each type of files. That does not mean you must install the RoadMap files in every of these directories, only that you can install the files in any of these directories.

One reason for RoadMap to support a list of directories is to define a default system-wide configuration, and at the same time to allow a specific user to install their own setup. Another reason (for the map files on a PDA) is to let the users choose the type of hardware storage that is convenient for them.

Directory pathnames in most RoadMap path lists (on UNIX -- these are not yet implemented in the Windows code) can include several "shortcut" characters:

- If a path begins with '~', then the rest of the path is relative to the users home directory (i.e, $HOME). This is similar to the behavior of many UNIX shell programs.
- If a path begins with '&', then the rest of the path is relative to the RoadMap "user" directory, which is $HOME/.roadmap.
- If a list of pathnames includes a path ending with "/..." then that path, plus the entire sub-tree of (unhidden) directories beneath it are added to the list of pathnames. So if Map.Path is set with:

            Map.Path: /etc/roadmap,&/maps/...

  and ~/.roadmap/maps/moremaps/foo and ~/.roadmap/maps/.secret/bar are both actual directories, then the final list of paths used when looking for maps will be:

  - /etc/roadmap
  - $HOME/.roadmap/maps
  - $HOME/.roadmap/maps/moremaps
  - $HOME/.roadmap/maps/moremaps/foo

  /etc/roadmap will not be searched for subdirectories, because it was not specified with a trailing "/...", and nothing below ~/.roadmap/maps/.secret will be searched, because ".secret" is "hidden" in the traditional UNIX sense. The subdirectory search will follow symlinks.

  This feature can be used, for instance, to help keep maps of a single region together, by letting them be more easily put into separate directories. If a subdirectory may come and go while RoadMap is running, e.g. if it's on removeable media, then it should be named specifically in the preferences -- list of subdirectories is only enumerated at startup.

### 4.3.1 EXECUTABLE FILES

The RoadMap programs should be installed in a standard executable directory. This is an easy one: the only requirement is that this directory must appear in the PATH variable (either you choose an existing directory or you add your own).

### 4.3.2 CONFIGURATION FILES

RoadMap comes with some critical configuration files (files sprites, preferences, etc..). RoadMap supports these files to be in a few different places, which list cannot be changed in the user preferences since it is used to load the preferences themselves. The list can, however, be changed using the "--config=..." commandline option.

On most UNIX systems this list is:

- /etc/roadmap,
- /usr/local/share/roadmap (preferred path),
- /usr/share/roadmap
- an site-specific directory chosen at compile time, and
- ~/.roadmap (the "user" directory, which can be referred to as '&' in other path references). The specific value of the path to the "user" directory is configurable, using the General.UserPath setting.

These directories are searched sequentially: any configuration item found in one directory overrides all the same items found in the directories listed before. In other words, the configuration is loaded in the following order:

1- /usr/share/roadmap (installation defaults)

2- /usr/local/share/roadmap (local site defaults)

3- /etc/roadmap (local machine defaults)

4- ROADMAP_CONFIG_DIR, chosen at compile time

5- ~/.roadmap (current user configuration)

The directory ~/.roadmap contains the user configuration: any user change to the configuration is written there. The items in the user configuration take precedence over the "default" configuration as defined in the "shared" directories. This directory can be referred to with the shorthand '&' in other parts of the roadmap config.

The directory ~/.roadmap usually has two subdirectories: trips and maps. "Usually", because while the directory ~/.roadmap/trips is used as the default location for the trip files, it can be changed with the General.TripsPath setting. Note that trip files can be stored anywhere, not only in that directory -- they're just more convenient for selection when stored there..

The directory ~/.roadmap/maps contains map files specific for this user. As a general rule, it is not recommended for each user to have their own copy of the maps, as these maps take a lot of space. This directory can be used however when maps are downloaded on the fly, as shared maps are usually not writable for users. The local rules can be established so that either all users download maps into the shared repository, or else each user manages his own maps. On a PDA or on a personal desktop systems the first solution makes the more sense, but for public access computers (such as computers at an University) the second solution might be the most convenient.

These user configuration directories are created when needed, if they do not exist.

Althrough the Sharp Zaurus is a Linux (i.e. UNIX) PDA, it's setup is somewhat unusual, and the location of the configuration files is different.

The rational for the selected setup, which is typical of a PDA, is to try to make RoadMap an auto-installed option when sliding in the proper memory card. So the locations for files always include the Zaurus mount points for the CompactFlash or SD cards.

The configuration directories on the Sharp Zaurus PDA are:

- /opt/QtPalmtop/share/roadmap,
- /mnt/cf/QtPalmtop/share/roadmap (preferred path),
- /mnt/card/QtPalmtop/share/roadmap and
- ~/.roadmap.

Like the Zaurus, Windows CE based computers are usually of the PDA type, so the same approach as for the Zaurus is used here, i.e. we make it possible to install all RoadMap files in a memory card.

The configuration directories on Windows CE are:

- \Program Files\roadmap
- \Storage Card\roadmap (preferred path)

As Windows CE does not really have the concept of a user directory, RoadMap will automatically add to the list the directory where its executable stands.

### 4.3.3 ICON FILES

RoadMap (GTK version) needs some icons. These icons must be placed in the operating system's standard locations. On UNIX, this usually is:

- ~/pixmaps,
- ROADMAP_CONFIG_DIR/pixmaps, chosen at compile time,
- /usr/local/share/pixmaps or
- /usr/share/pixmaps.

This list can be changed using the General.IconPath setting.

### 4.3.4 MAP FILES

RoadMap needs some map files to serve any useful purpose.

The location for these map files can be redefined in the user preferences (item Map.Path). The maps are a problem of their own, since they may require a huge space (up to 1.8 G Bytes for the full set). It is recommended to share these maps between users. Because these maps are architecture-dependent you should be careful, however, not to share them on a network (this could also be very inefficient, as this could saturate the network and the RoadMap performances would be severely impacted).

Maps can be located in any directory mentioned in the Map.Path preferences setting. The index file, usdir.rdm, must also be in one of those directories.

RoadMap will only consult a single usdir.rdm file at a time. The first usdir.rdm index file read by RoadMap must index any and all maps you might wish to view. This means that if you've built a subset of the maps, with a corresponding usdir.rdm file (using "buildus"), then when you build more maps, you can't create and install a second usdir.rdm file and expect RoadMap to use them both. A new usdir.rdm must be built which indexes all of the maps.

RoadMap will only read the index file once, even if a newer version becomes available. RoadMap must be restarted in order to take advantage of a new usdir.rdm index file. In contrast, new map files can be added to the Map.Path directories, and RoadMap will find them as needed. This means that maps kept on removeable storage devices can be used fairly easily. [ The one caveat when introducing replacement maps is that RoadMap will only try and find a map when it really needs to. RoadMap will keep a number of maps open, for easy access -- the number is controlled by "Map.Cache". You may have to visit that many other maps before RoadMap will need to reopen a map file which you've visited before but subsequently replaced. ]

(The map search paths referred to below may be changed using the "--maps=..." commandline option.)

By default, RoadMap is built to search for the following directories on most UNIX systems:

- ~/.roadmap/maps/... (a.k.a. "&/maps") and its subdirectories,
- ROADMAP_MAP_DIR, chosen at compile time,
- /var/lib/roadmap/... (preferred path) and its subdirectories, and
- /usr/lib/roadmap/... and its subdirectories.

(Note that releases prior to 1.1.0 did not search subdirectories.)

RoadMap also searches in /usr/local/share/roadmap and /usr/share/roadmap, but this is in violation of the FHS filesystem standard, since these maps are not architecture-independent.

The Zaurus is a special case again, as the default path on these systems is:

- ROADMAP_MAP_DIR, chosen at compile time,
- /opt/QtPalmtop/share/roadmap/..., and its subdirectories,
- /mnt/cf/QtPalmtop/share/roadmap/... (preferred path) and its subdirectories, and
- /mnt/card/QtPalmtop/share/roadmap/... and its subdirectories.

The two last directories are located on a memory card, as this would be the only reasonable place where to install the maps considering their size.

The architecture-dependent nature of the map files is not an issue with a PDA, as these machines tend to be used standalone and not to rely on network access.

On Windows CE the default map search path is:

- \Program Files\roadmap\maps
- \Storage Card\roadmap\maps (preferred path)

## 4.4 DOWNLOADING ROADMAP

RoadMap can be downloaded from the RoadMap web site:

- http://roadmap.sourceforge.net/download.html

A quick way to get a feel for RoadMap is to download and install the contents of this tar file, which contains the US state boundary outlines, the detailed map of San Francisco, and a minimal directory file which will let RoadMap use them.

- http://roadmap.digitalomaha.net/maps/demo_maps.tar.gz

The complete set of maps is available here:

- http://roadmap.sourceforge.net/maps.html

The full RoadMap directory file (usdir.rdm) must be downloaded first, as RoadMap will not work without it.

- http://roadmap.digitalomaha.net/maps/usdir.rdm.tar.gz

Please refrain from downloading all the US states at once, as the map files are huge and the bandwidth is expensive.

It is recommended to install the maps in one of the default directories (see previous section). You may also install the maps in any directory, assumed you set Map.Path accordingly in the RoadMap preferences.

Previously, RoadMap came either as a set of sources, or as a set of binary files. This is no longer the case -- it is not hard to build, and there are choices to be made when building, so the source tarball is all that is currently available.

## 4.5 INSTALLING FROM THE FAMILIAR PACKAGE

If available at all, the RoadMap familiar distribution contains one .ipk package file. This package contains the RoadMap executables (roadmap and roadgps) as well as the configuration files for a GTK 2.0 setup (such as the Familiar 0.7.2 GPE image). This package does not contain the map files or the map index file.

If RoadMap is available from your feed:

          ipkg install roadmap

If you downloaded the ipk files on the iPAQ:

          ipkg install roadmap_X.Y.Z_arm.ipk

RoadMap is useless without maps. The maps can be downloaded from the web site (http://roadmap.sourceforge.net/maps.html or mirrors) or generated from the US Census Bureau's files (see later).

It is strongly recommended you install the maps on a CompactFlash or SD/MMC card, and not on the iPAQ internal flash. The reason is that the maps are way too big to be installed on the iPAQ flash. As configured, RoadMap will look for the maps either in

- /mnt/hda/share/roadmap or
- /mnt/card/share/roadmap.

(This can be changed using the Map.Path item in the RoadMap preferences dialog.)

The set of maps for California represents more that 100 Mbyte of data, the whole US about 1.6 Gbyte. Unless you are the lucky owner of a large capacity CompactFlash, you will have to install a subset. A capacity of 128 Mbyte is enough in most cases, 64 Mbyte might be enough if you do not travel far from home.

To build the maps yourself, you need the Linux/i686 binary or the source tarball. See the next section for more details.

## 4.6 INSTALLING FROM THE SOURCE TARBALL (UNIX)

It is also possible to rebuild RoadMap and the map files from scratch from the source distribution:

1. Install the development libraries for GTK+ 1.2, GTK+ 2.0 or Qt.
2. Install the shapelib, expat, popt development libraries. Shapelib is required for building maps from some data sources (though not the US Tiger data). The libpopt library is also optional if you won't be building your own maps. And libexpat is optional, except that you won't be able to save or restore route, waypoint, or track information.
3. Unpack RoadMap's tarball:

             tar xzvf <tarball>

4. Edit the config.mk file found in the src directory, and choose one of GTK, GTK2, QT, or QT4, along with other build options, described in the comments of that file.

   Simply typing "make" will build the default selection in config.mk. (GNU make is required.)

   Note for QT users: the RoadMap QT module is built with QT3 by default, but requires the QT2 compatibility headers.

   The complete list of options for building RoadMap is as follow. These can all be modified by editing config.mk.

   DESKTOP=GTK2|GPE|GTK|QT|QPE|QT4|QPE4|WINCE
     Compiles RoadMap for a specific GUI environment. By default GTK, GTK2 and QT are built. The GPE environment is a PDA variant of GTK2 and the QPE environment is a PDA variant of QT. (WINCE attempts to use the arm-wince-mingw32ce cross-compiler to build RoadMap for the Windows CE environment. As of this writing, the result does not yet work.)
   SHAPEFILES=NO
     Do not link buildmap with the shapelib. The side effect of this option is that some map sources cannot be converted to RoadMap files anymore. These include the Digital Charts of the World, the Canadian RNF road maps, and the US State boundary outlines. This option is to be used only when the shapelib library is not available.
   EXPAT=NO
     Do not link roadmap with the expat library. The side effect is that you cannot load or save trips or landmarks anymore.
   POPT=NO
     Do not build buildmap. (RoadMap itself does not use libpopt.) You will be able to use pre-built maps, but not build any of your own.
   AGG=NO
     Do not try to link roadmap with the agg library. This optional library, currently supported for the GTK2 and Win32 desktops, can give much prettier (anti-aliased) lines and text.
   MODE=DEBUG|PROFILE
     Compiles RoadMap in debug mode. The PROFILE option also generates the necessary information and code for profiling.

     1. download some maps from the US Census bureau:

        http://www.census.gov/geo/www/tiger/tiger2006se/tgr2006se.html

        This download can be automated by using the shell script roadmap/src/rdmdownload:

                  rdmdownload <tiger-path> [<state-symbol> ..]

        (To download older versions of the maps (e.g. 2000), see the script for the options available.)

     2. download the list of counties from the US Census bureau:

        http://www.census.gov/geo/tigerline/app_a02.txt

        (A world-extended version of app_a02.txt is provided in directory src, so you should probably skip this step.)

     3. Build the maps:

                  rdmgenmaps <tiger-path> maps=<map-path>

        This command processes all the Census Bureau files found in tiger-path and creates the map files for RoadMap in the map-path directory. There is one map file generated for each county. (To build older versions of the maps (e.g. 2000), see the script source for the "format=2000" option.) Alternatively, specific counties can be built. The county shall be identified by its FIPS (e.g. 06075 for San francisco, CA).

                  rdmgenmaps <tiger-path> [maps=<map-path>] <county> ..

        The rdmgenmaps command can also process one full state at a time:

                  rdmgenmaps <tiger-path> maps=<map-path> state=<state-id>

        where the state-id is the two first digit of the FIPS (such as 06 for california).

        The rdmgenmaps tool is a shell script that extract the TIGER files from the downloaded ZIP files, invokes the buildmap tool and then cleans up the TIGER files. Last, rdmgenmaps invokes the buildus tool to generate the US states and counties catalog. The main purpose of rdmgenmaps is really to keep the TIGER files in compressed form, considering their huge size..

        The buildmap tool takes a county "FIPS" and a TIGER file as input and produces one RoadMap .rdm map file. The tool uses the popt library for parsing the command line arguments: the option --help gives more information about the available options. (On Debian or Ubuntu linux systems, use "apt-get install libpopt-dev" to install the popt development library.)

        Here is an example:

                  buildmap 01001 /tmp/TGR01001.RT1

        The buildus tool creates a catalog of maps that is used by RoadMap to combine all states and counties into a giant US map. It looks for:

        1. the file AllSt.txt and
        2. the various existing RoadmMap maps.

        This is not a problem if the catalog references a map file that does not exists: this way it is possible to store locally only a small portion of the US maps. This is useful when using a PDA with limited storage space (like the iPAQ).

        The buildus tool also uses popt for parsing the command line arguments: the option --help gives more information about the available options.

     4. run make to install roadmap:

                  make install

        This last step installs the RoadMap executables. These executables and the maps should have been generated at their proper location in steps 3 to 8. The install is not required for running RoadMap: the programs and build tools) can run from the local directory as well.

## 4.7 INSTALLING FROM THE SOURCE TARBALL (WINDOWS CE)

RoadMap can be built from sources for Windows CE on a Windows XP or 2000 computer. The Embedded Visual C++ tool version 3 or 4 is required. These tools can be downloaded for free from the Microsoft web site, see:

http://msdn.microsoft.com/embedded

Note that not all RoadMap programs can be built on Windows. More specifically, the tools used to build the maps are available only on UNIX. However the maps available from the RoadMap web site do work with the Windows version of RoadMap.

The directory src/win32/wince_env contains a workspace file (Roadmap.vcw) that must be used to build roadmap and roadgps.

## 4.8 CROSS COMPILING FOR THE FAMILIAR TARGET

The cross compiler for the Familiar/Linux target requires some additional make options: LDFLAGS, OPTIONS, CC, AR, STRIP and X11LDFLAGS. For example:

LDFLAGS="-Xlinker -rpath-link -Xlinker /usr/local/arm/3.3.2/arm-linux/lib:/usr/local/arm/3.3.2/lib -L/usr/local/arm/3.3.2/lib" STRIP=arm-linux-strip CC=arm-linux-gcc AR=arm-linux-ar CC=arm-linux-gcc AR=arm-linux-ar STRIP=arm-linux-strip OPTIONS="-march=armv4 -mtune=xscale" X11LDFLAGS="-lXinerama"

In addition a few environment variables must be defined or modified:

PKG_CONFIG_PATH must be set to the right tool (for example: /usr/local/arm/3.3.2/lib/pkgconfig).

The PATH variable must contains the cross compiler directory (for example: /usr/local/arm/3.3.2/bin).

## 4.9 A NOTE ABOUT THE ROADMAP ICONS

The RoadMap toolbar uses road signs as icons. These icons come with the application (in directory src/icons). The icon source set is made of a mix of PNG and XPM files. The final icon files must all be PNG.

A make script builds all the necessary files using the ImageMagick package. The icon files are built (or installed) when building (or installing) RoadMap.

The PNG icon files must be installed in one of the following directories (the order below reflects the search order):

          ~/pixmaps
          /usr/local/share/pixmaps
          /usr/share/pixmaps

## 4.10 TROUBLESHOOTING THE INSTALLATION

This section describes the most common problems encountered when installing RoadMap:

- When running "make build" a compiler error message appears, complaining that the file shapefil.h cannot be found. This is typically happening if the shapelib library was not installed. The shapelib library is only used to create additional maps using the Digital Charts of the World. If only the US maps are required, or if the pre-built maps will be used, it is possible to build RoadMap without the shapelib, using the option "SHAPEFILES=NO" in config.mk.
- After RoadMap has been installed, the display only shows the message "No map available" or a blank screen. RoadMap must be provided with a position before it can show something meaningful. It is recommended to enter a known address to setup a position. Another way to feed a position is to install a GPS device RoadMap can talk to.
- The display shows no street; lakes, parks, airport and hospitals appear as block areas. This is typical of a missing "class" file. This file, usuall "default/All", must be located in the RoadMap configuration directory. It is likely the "make install" step was not performed.
- The display is all black. RoadMap seems to find the map files and one can select streets on the screen, but it seems everything is drawn black on black. Be sure all of your configuration files are up to date, and that none are being "shadowed" by older files in your ~/.roadmap directory. This may also happen on a QPE-based PDA: this may be a problem with QPE not defining color names. Try redefining all colors in schema using the RGB syntax ('#' followed by an hexadecimal RGB value).
- Waypoints, the compass and the vehicle's location all appear as small black squares. This is typical of a missing "sprites" file. The "sprite" file must be located in one of the RoadMap configuration directories. It is likely the "make install" step was not performed.
- If things do not go any better, start roadmap with the --debug option and check what roadmap tells you it is doing.

# 5 ROADMAP APPLICATIONS

RoadMap includes the following applications:

roadmap
  This is the main application. It displays the map and can keep track of the current GPS position. Depending on which toolkit you use, this will be roadmap/src/gtk/gtkroadmap, roadmap/gtk2/gtkroadmap or roadmap/src/qt/qtroadmap (zroadmap on the Zaurus).
roadgps
  A very handy GPS console, inspired by the Garmin satellite status page, with a NMEA log capability. Thanks to gpsd, roadgps and roadmap can be active at the same time. Depending on which toolkit you use, this will be named roadmap/src/gtk/gtkroadgps, roadmap/gtk2/gtkroadgps or roadmap/src/qt/qtroadgps (zroadgps on the Zaurus).
buildmap
  A program that takes the US Census Bureau files as input and produces the map files used by roadmap. This application is to be run once on a desktop or beefed-up laptop to prepare the map files and is not needed when using roadmap.
buildus
  A program that takes a set of roadmap map files and produce a directory file that helps roadmap choose the map(s) to display according to the location or city. This application is to be run once on a desktop or laptop and is not needed when using roadmap.
dumpmap
  Display the data tables from a map file. This application is used for debug purposes only and is not needed when using roadmap.
rdmgenmaps
  A script to simplify the generation of the maps.

# 6 USING ROADMAP

## 6.1 COMMAND LINE OPTIONS

The options marked as "sticky" remain in effect the next time RoadMap is run. The use of the option actually changes the specified RoadMap preferences item.

The RoadMap application accepts the following command line options:

--config=PATH
  Replace the built-in search path for system configuration data. While this will usually just be a simple directory path, it can actually be a comma-separated list of paths from which RoadMap should load its config. User directories (usually "~/.roadmap" will still be processed as usual.
--location=LONGITUDE,LATITUDE
  Set the location point (see menu entry "Show Location.."). This option is sticky (preference item Locations.Location=LONGITUDE,LATITUDE).
--metric
  Use the metric system for all units. This option is sticky (preference item General.Unit = "metric").
--imperial
  Use the imperial system for all units. This option is sticky (preference item General.Unit = "imperial").
--no-area
  Do not show the polygons (parks, hospitals, malls, airports, etc..).
-geometry=WIDTHxHEIGHT
  See option --geometry=WIDTHxHEIGHT.
--geometry=WIDTHxHEIGHT
  Sets the geometry for the RoadMap main window.
--geometry:WINDOW=WIDTHxHEIGHT
  Set the geometry of a specific RoadMap window, according to its title. --geometry:Main=WIDTHxHEIGHT is equivalent to --geometry=WIDTHxHEIGHT. If the window's title includes any space, dashes can be used in place of the spaces (the goal here is to be shell friendly). This option is sticky (preference item Geometry.WINDOW = WIDTHxHEIGHT). To set the default geometry of all unspecified windows, use --geometry:Default=WIDTHxHEIGHT.
--no-toolbar
  Do not show the toolbar. This option is sticky (preference item General.Toolbar = "no").
--no-icon
  Do not show any icon, i.e. keep as much space as possible for the map. This option is sticky (preference item General.Icons = "no").
--map-boxes
  Show map bounding boxes as grey lines. This is mostly just for debug purposes, but can be useful in figuring out why no map is in view at your current location.
--square
  Show squares boundaries as grey boxes. This option is for debug purpose only.
--gps=URL
  Use a specific GPS source. This option is not sticky: it overrides the preferences setting this time, but the preferences setting is not modified. The main use of this option is to rerun GPS logs created using roadgps, or to run logs created using gpsbabel, from other input sources. For instance: gpsbabel -i gpx -o nmea,gprmc=1 infile.gpx outfile.nmea will create an NMEA logfile from a GPX format file created elsewhere, or even from a tracklog created by roadmap itself.
--trip=FILENAME
  tells roadmap to make the given GPX tripfile current.
--debug
  Print all informational and debug traces.
--debug=source,...
  Print all informational and debug traces for the specified source files only (a comma-separated list of source files).
--verbose
  Print all informational traces.
--help
  Show a description of all command line options, key bindings and actions (see the section CONFIGURING THE MENUS AND TOOLBAR).
--help=SECTION
  Show a description of either the command line options (--help=options), the key bindings (--help=keymap) or the actions (--help=actions).

## 6.2 GETTING HELP

The main RoadMap window includes a "Help" menu. This help can be used to display various topics from this document. The help text is actually an HTML version of this file, shown using a web brower. The default browser is "dillo", but this default can be changed in the user's preferences (see section PREFERENCE ITEMS).

## 6.3 THE ROADMAP DISPLAY

The main RoadMap window shows the menu, the toolbar and the map's canvas. The toolbar is optional: all the commands are also available from the menu bar or from the keyboard or iPAQ buttons.

When RoadMap starts, the map view reflects the previous session's mode If no session data is found, RoadMap tracks the current GPS position. It is possible to select another mode: show the current destination point (see the section "Managing Trips" below), show a specific location, track the GPS position with the north shown up, track the GPS position with the direction of movement shown up, etc.

When RoadMap is in GPS tracking mode, the map view will reflect the movement of the car so that the GPS sprite will remains at the predefined position (usually the center, but it is possible to move the position of the GPS sprite using the arrow keys). The map can be held to its current position: the "hold" button freezes the map view to its current location, but updates will continue, so that, for example, one should see the GPS sprite move away from the map's center. The hold mode make it easy to select streets and read street names while on the road. To come back to the original map view, this view must be re-selected (for example by using the menu command Find / GPS position or the "G" toolbar button).

RoadMap indicates the current street a few seconds after the GPS position reached the street. This display is also shown for a limited time. There are several criteria used by RoadMap to "lock" on a street: the distance to the street (the closest the better, not more than the value set with Accuracy.Street), the direction of the street compare to the direction of the vehicle or if the street is connected to the current "locked" street. RoadMap uses fuzzy logic to combine these criteria into one single value. None of the fuzzyfied values for the distance and direction may be below the value set by Accuracy.Confidence, or else the street is not selected. The final fuzzy value must also be above the same limit. RoadMap then selects the street with the highest fuzzy value.

RoadMap can also display four messages at each of the corners of the map: the message at top left will be shifted to leave room for the compass, which shows map orientation. These messages can be defined by the user using RoadMap's specific format strings (see section "Configuring the RoadMap text and voice messages").

## 6.4 USING THE MOUSE OR PEN

RoadMap uses mostly one mouse button (the left button on a 3 button mouse). This is because RoadMap is designed for a PDA, where pens are used.

A short mouse click (or pen tap) on the map screen displays information (i.e., name, address range, etc, as appropriate) about the closest waypoint, landmark, street, road or freeway. This display is shown for a limited amount of time (see preference "Highlight.Duration"). Whether or not one of those map features is near enough to be selected, the clicked/tapped point will be remembered as the current "Selection", for the purposes of adding new waypoints or landmarks.

A long mouse click or pen tap (with no accompanying motion) will bring up a popup menu (see preference item "Events.Long Click").

Dragging the mouse with the button down, or dragging the pen on the screen, moves the map display according to the movements of the mouse or pen.

Dragging a map display is a CPU-intensive action, so a few "Style" preference items can be used to limit the amount of drawing to be performed while doing it.

A few additional actions are specific to the mouse devices, with no pen equivalent: the mouse's right button and wheel.

A popup menu can be attached to the mouse's right button (see preference item "Events.Right Click"). The menu iteself must be defined in the file roadmap.popup (see section CONFIGURING THE MENUS AND TOOLBAR).

Mouse wheel actions will trigger a zoom in and out of the map display, depending on the direction of the wheel movement.

## 6.5 VOICE INTERFACE

If the flite program has been installed, or if RoadMap was configured for an available speech application, RoadMap will complement the screen information with an audio one: Roadmap will "tell" the name of the street on the audio output device. As a general rule, RoadMap tries not to repeat the same message again, as frequent audio messages tend to border on the irritating side. Thus if the same street is selected more than once, the screen information will be displayed each time, but the voice messge will be provided only once. As voice messages tend to take a significant time to be produced, RoadMap memorizes the latest message requested while the current message was produced and will "air" it after the current message has been completed. Only one message is stored that way, the last requested one: any message generated in between is ignored.

It is possible to mute the RoadMap's voice, using the File / Mute Voice item from the menu bar. The voice can be enabled later using the File / Enable Voice item.

Please note that it is possible to rebuild flite with a better voice than the default one. The flite source is available at the CMU web site:

http://www.speech.cs.cmu.edu/flite/

The flite README file describes how to regenerate flite using another voice. Here is an example, courtesy of Scot Wilcoxon:

         cd flite
         make clean    # to remove old executable files
         ./configure --with-vox=cmu_us_kal16
         make

## 6.6 KEY BINDINGS

Most of the RoadMap commands are available from the keyboard (so to answer requests from my loyal Zaurus fans :). In fact, the button and key bindings are common to all ports, but some buttons might not exist on some platforms.

Please note that all the button and key bindings are case insensitive, i.e. the same binding applies to 'A' and 'a' (as well as to "Button-Left" and "button-left"--whatever it means).

On a desktop or laptop (or on the Zaurus), the keyboard keys are mapped as follow:

Button-Left | Move the map view to the left.
Button-Right | Move the map view to the right.
Button-Up | Move the map view up.
Button-Down | Move the map view down.
+ | Zoom in: enlarge the central part of the map.
- | Zoom out: show a larger area.
A | Show a specified address.
B | Start the trip back to the departure point.
D | Show the destination point.
E | Erase maps among those currently visible.
F | Toggle the full screen mode.
G | Show the GPS position.
H | Hold the map view in its current position.
I | Show a specified street intersection.
J | Rotate the map counterclockwise.
K | Rotate the map clockwise.
L | Show the last selected location.
M | Enable/Disable map download.
N | Create a new trip.
O | Open an existing trip.
P | Stop tracking the current trip.
Q | Quit RoadMap.
R | Set the map back to the default zoom level.
S | Start tracking the current trip.
T | Toggle display of the current track.
U | Center the map on the GPS position (north up).
W | Set the selected street block as waypoint.
X | Find an intersection.
Y | Save a screenshot of the current map display.

The current bindings that are used by the application are printed after the options help information when the --help option is used.

Note for Familiar 0.7.1 GPE users: the GPE environment has defined the button bindings in a way that makes it impossible for RoadMap to use them (the buttons are mapped to the GPE applications). In this environment it is recommended that the toolbar be enabled to replace the buttons. The joypad is still available.

## 6.7 ON-THE-FLY MAP DOWNLOAD

Map downloading is being rewritten: future versions will download rdx files from the RoadMap web site (or from a user specified site).

Today's PDA have a limited storage space, which must be shared with MP3 and other files. As the RoadMap maps can take up to 1.6 GB, most PDA users will want to install only the few maps they need. The on-the-fly download feature of RoadMap helps the user to select visually which maps to download or remove. RoadMap is capable of downloading compressed maps: gzip, bzip2 or lzop compressed files are automatically recognized and uncompressed after transfer.

The map download is available in a special RoadMap mode, which can be activated and deactivated using the Map Download menu entry. On startup the download mode is always deactivated. RoadMap shows a red "download" icon in the right top corner of the map screen to indicate that the download mode has been activated.

In the download mode, if a map is not found by the display engine, the user will be asked for the permission to download the file from the configured source (as defined in the preference item "Download.Source"). The destination directory can also be configured (using the preferences item "Download.Destination"). Both the source and the destination file name can be edited manually before each download.

RoadMap is designed to support multiple download protocols. The protocol is selected depending on the source string, as much as possible using the well-known URL syntax. Two protocols are available: a local file copy (the source is either a full path or a "file://*" URL) and the HTTP protocol (the source is a "http://*" URL). The local file copy protocol can be useful in some cases, for example when mounting the map server's disk using nfs or smbfs.

If the suffix of the downloaded file matches a well-known compressed files suffix, RoadMap will invoke the appropriate tool to uncompress the file. The compression tools supported are gzip (.gz suffix), bzip2 (.bz2 suffix) and lzop (.lzo suffix). This feature makes it possible to store compressed maps on the server side. Using compressed files may reduce by a factor of two the time it takes to download the map, depending on the compression tool used, the specific map's content, etc.. Note that maps are always stored uncompressed: because RoadMap maps the file in memory, compressed file cannot be used by RoadMap.

If the user cancels the download of a specific map, RoadMap will not request the same download again for the remainder of the session. This means that RoadMap will request the same maps again if stopped and then restarted. This was done because there is at this time no way for the user to change his mind and re-request the download of a cancelled map. This is a part of the user interface that is likely to change in the future.

RoadMap also provides a dialog for deleting maps, activated through the "Delete Maps.." menu entry. The dialog shows the number of map files stored locally, the total size of the local maps and the list of maps currently visible on the RoadMap screen. The proper way for selecting maps to delete is to view an area you do not need anymore, hit the "Delete Maps.." entry, then select a specific county and hit the Delete button. The county will immediately disappear from the map screen and the dialog gets updated (i.e. the map statistics and the map list will reflect the latest delete action). Several counties can be deleted this way before the dialog is closed (button "Done").

Note that a deleted map is automatically added to the "cancel download" list, so that RoadMap will not request for this map again. As such, it is not a problem to delete maps while the download mode is active. If you need to download again a map that was deleted, just restart RoadMap.

A typical use of the download feature is to preload the maps you need before you go on a trip. Activate the download mode and select the destination address: RoadMap will request the download on the map that covers this destination. Zoom out the display to force the download of adjacent counties, if required. Repeat for each place you are likely to go to. Use the arrow keys or buttons to "fly over" the roads you are going to travel on. If you missed a map, and you did set a public map web server, it should be possible to download maps from an hotel's Internet access. Of course, if you are (rich and) lucky enough to have an Internet connection while on the road, the download feature can also be used at any time.

Here is a typical setup using the HTTP protocol:

1- Install the individual map files, gzip-compressed, in a "maps" subdirectory of the web server directory tree. Say the web server is named "desktop".

2- Set the preference Download.Source to http://desktop/maps/usc%05d.rdm.gz

3- Set the preference Download.Destination to /var/lib/roadmap

4- Make sure the preference Map.Path does include the directory /var/lib/roadmap.

## 6.8 WAYPOINTS AND ADDRESSES

RoadMap manages several types of points: a location point (selected using a street address or the mouse), the GPS position (updated automatically if a GPS fix is available), and an arbitrary number of user-defined waypoints, which may appear as part of a route or a track.

One can select which one of these locations serves as the center of the map. The GPS and waypoints positions are special cases: see the section on trip management.

The location point is really a buffer for the selection of a street block. Once selected, the point can be defined as a (new) waypoint or as the destination, by using it to establish a new trip. Thus the definition of a destination or waypoint is a two step procedure: (1) select a location, and (2) use the selected point to create a waypoint or a new route (in the Trip menu).

The location point can be entered in one of three ways: - by clicking on a location on the map, - by entering a valid USPS address (street number, name, city and state names) in the dialog launched by the "Show Location.." menu entry, - by specifying the intersection of two streets in the dialog launched by the "Show intersection.." menu entry.

More details are provided in the following sections.

## 6.9 STREET NAME OPTIONS

Street names are used in the two dialogs used to select a specific location: the address and intersection dialogs. These dialogs follow the same rules regarding the format of the names.

When entering a street name, the street prefix and suffix, if provided, must be among the abbreviations listed by the US Census Bureau (N for north, SW for southwest, etc..). The "type" part of the name (i.e. "Rd", "St", "Pl") can be given using either the Census Bureau abbreviation, or by spelling it out in full (i.e., "Road", "Street", "Place"). In almost all cases, the US Census Bureau conventions follow the usual abbreviations, so there is no need to worry here. In addition, any of these fields is optional: not providing them only makes the search less selective. If several matches are found, RoadMap shows a list of all matching streets and lets the user select the appropriate one.

The exact format of the data expected by RoadMap as a complete street name is as follow:

             [prefix ' '] name [[' ' suffix] ' ' type]

The name itself may include space characters. Potential conflicts are resolved by excluding the prefix, suffix and type fields from the name only when a match is found with the valid set for that county. As such, the following names would work OK in any circumstances:

             N Rio del Sol St   --> RoadMap detects both a prefix and a type.
             Rio del Sol St     --> RoadMap detects the type, no valid prefix.
             N Rio del Sol      --> RoadMap detects the prefix, no valid type.
             Rio del Sol        --> RoadMap detects no valid prefix or type.

Lets go through an example: we will search for 100 East Washington Boulevard in Los Angeles, California. The name of the street should be typed as follow:

             e washington blvd

The 'e' stands for "east", 'blvd' stands for boulevard, according to the US Census Bureau documentation. Note that RoadMap is not case sensitive.

The result is a single match, so RoadMap shows the location immediately without any additional question. However it is possible to omit either the prefix, street type, or both, with the effect of broadening the search. Let say we entered:

             washington blvd

Now RoadMap display a dialog that lists 3 matches:

             Washington Blvd, Los Angeles
             W Washington Blvd, Los Angeles
             E Washington Blvd, Los Angeles

The first item in the list is shown selected, and RoadMap displays a new location in the map display. In fact, each time the user selects one address in the list, RoadMap displays the corresponding map location. When the user hits the OK button, this simply confirms the current choice as the final one.

Note that not providing a prefix, suffix or street type does broaden the search, but the street name must always be provided in full: at that time RoadMap provides only an exact street names search. Thus providing "wash" instead of "washington" only triggers the error message "No street with that name could be found".

## 6.10 OTHER ADDRESS OPTIONS

It is possible not to specify the street number part of an address: in that case, all street blocks matching the street and city names will be listed. Be careful, that might make a long list, and RoadMap has a limit of 256 items per list (matching items beyond the 256th one are discarded).

It is also possible to specify an approximate city search: if the city name is prefixed with a character '?', then the name of the city is used to find the county, but is not used in the street match: the idea is to list all similar addresses around (i.e. in the county). This is useful when one is not sure of the city name, or only knows the name of a city nearby.

## 6.11 SELECTING AN INTERSECTION

The "Intersection.." menu entry activates a dialog that asks for two street names and a state name. RoadMap will search within the given state for all intersections between streets that match the street names provided. This search may take a few seconds, especially if the maps must be read from disk.

In the (likely) case where multiple intersections have been found, RoadMap displays a list that shows the name of the city and the name of the county where each intersection is located. This selection list follows the same rules as the address selection list described in the previous sections.

## 6.12 SELECTING A POSITION

The "Position.." menu entry activates a dialog that asks for a longitude / latitude position. The format for the longitude and latitude must conform to the ISO 6709-1983 standard (with some extensions).

The format for longitude is:

       [+-EW][d]dd[mm[ss]][.ffffff][EW]

The format for latitude is:

       [+-NS]dd[mm[ss]][.ffffff][NS]

Where "[d]dd" or "dd" stands for the degrees, "mm" stands for the minutes, "ss" stands for the seconds and "ffffff" stands for the fractional part (either fraction of degrees, minutes or seconds, depending on the context).

The main extensions compare to ISO 6709 are as follow:

- the letters 'E', 'W', 'N' and 'S' are recognized as a replacement for '+' or '-', either as prefix or suffix.
- the longitude may be expressed with 2 digits for the degrees.

## 6.13 MANAGING TRIPS

RoadMap supports an infinite number of trips: each trip context is saved in a trip file. One trip at a time can be edited or activated. A saved trip can be reloaded from the trip file, of course.

The last trip created or loaded will be reloaded the next time RoadMap starts. If the name of the trip has been specifically set by the user, it will appear in the titlebar of the RoadMap window.

A trip is a (usually small, but unlimited) collection of landmarks, routes, and tracks which (usually) have some relationship to one another.

Routes are sequences of waypoints that (usually!) lead you somewhere you want to go. Tracks are sequences of recorded waypoints that show you where you've been. Although one doesn't usually do so, a track can be followed just as a route can be followed.

Trip landmarks are waypoints that aren't in a route or a track. They're just (presumably) interesting all by themselves. (The trip's landmarks are distinct from another set of landmarks known as your "Personal Landmarks". The "personal landmarks" are displayed on the map no matter which trip is loaded.) Landmarks and waypoints are sometimes just referred to as "Places".

One end of a route is the starting point, and the other is the destination. Comments attached to the route's waypoints are used to give directions from one waypoint to the next. Routes can be reversed, in order to traverse them backwards (but the comments don't get rewritten). Reversing a route will not change the trip file -- the reversal is completely internal to RoadMap.

When you load a trip (or when you start RoadMap, and the last trip you used is automatically re-loaded), you'll be presented with a menu of routes to choose from. (That is, if the trip contains more than one. If there's only one, it will be selected automatically.)

While you might choose to name your trips with a ".gpx" suffix, as a reminder of what format they're stored in, this is entirely optional. File suffix doesn't matter.

Note that although tracks and routes are conceptually separate, either type can be selected at this point, and any of the operations under the "Routes" menu can be applied to either.

One of the buttons in this "Manage Routes" dialog is "None", which is a quick way of not selecting any route at all.

### 6.13.1 Creating a route:

If you're starting a "fresh" trip, you'll likely start by creating a route. Choose a place that will be part of the route -- a waypoint, a landmark, a street address, a geographic location -- and then use the "Create New Route" menu entry to begin constructing your route. This will create an unnamed route with only one waypoint -- your destination.

A route with only one waypoint isn't very interesting, so you'll want to select more points along the route. To select a new place, you can a) click (or tap) on the street where you wish to go, b) use the "Find" menu items "Address...", "Intersection...", or "Position..." to locate it, or c) choose another, previously created place from the route, the trip landmarks, or the personal landmarks. After locating your new waypoint, use the "Add as waypoint" menu item to add each to the route. You'll have choices of where to add (at the beginning, at the end, or as a midpoint of the nearest route segment), as well as a chance to add it as a landmark, to either the trip's list, or your personal list. Continue adding waypoints to your route.

(If you do much route creation, you should create a toolbar button for the "addroutewaypoint" command. Then, the easy way to create a route is to first create a trivial route between the two endpoints as described above, and then points on the map and add them with your toolbar button. The route will "snap" into place through each new point you add.)

Note that waypoints are always copied. So if you choose an existing waypoint or landmark to use as a route waypoint, you'll end up with a new waypoint, not just a second reference to an existing waypoint.

You can give your new route points names as you go, or wait until later and use the "Route Waypoints..." menu item to go back to the list, and select the ones you wish to rename or to which you wish to add comments. Waypoint deletion can be done here as well.

It is also possible to delete, edit, or move waypoints and landmarks by directly selecting them with the mouse. Use a short click to select the place of interest -- its identifying information will be shown along the bottom of the screen. Then use the appropriate menu command to delete, edit, or move the selection. These commands are most readily accessed via the "long click" menu. If doing a move, you'll select the place, then choose the "Move place" command, then click or tap at the new desired location.

Your route doesn't yet have a name. That's fine -- routes and tracks can be unnamed. If there's only one route in a trip file, it's no big deal, but if there's more than one, you might want to give them names to help keep them straight. You do this (you can also add descriptive text) from the "Manage Current Routes" menu item. This is also where you'd select a different route to work with. If your trip has tracks, they'll appear hear as well. Be careful with delete! There's no undo command. Note that in addition to having no name, multiple routes can have the same name. This will not confuse RoadMap, though it may confuse the user.

### 6.13.2 Converting a track to a route:

Another, perhaps less convenient, method of creating a route, is to base it on a track that you (or someone else) has already travelled. While it's possible to simply select a track and follow it as one would follow a route, there are usually too many trackpoints showing up and obscuring the actual roads. It's better to create a route from the track using the "Simplify Route" command. (Remember that all of the route commands apply to tracks as well.) If simplification was successful (i.e., if any waypoints could be eliminated) a new route will be created and selected. It will be named after the original, with "Simple ..." prepended to to the original name. (If it had a name -- otherwise the result is unnamed as well.)

### 6.13.3 Importing a route:

One advantage of using the popular GPX format is that routes and landmarks can be obtained from other sources. Not only are some GPS management programs converting to use GPX directly, but there are many "something-else-to-GPX" conversion programs available. There are many such programs listed at: http://www.topografix.com/gpx_resources.asp

One of the best, and most complete, of these conversion programs is gpsbabel, available here: http://www.gpsbabel.org/

There's also an online front-end to gpsbabel, here: http://www.gpsvisualizer.com/gpsbabel/

Gpsbabel will convert from most popular GPS data formats, and can talk directly to many GPS devices without involving their vendor's "support software" at all. [ RoadMap is particularly indebted to gpsbabel, since much of the code which supports RoadMap's GPX input and output came directly from gpsbabel. ]

One handy source of route and waypoint data these days is Google Maps. Google directions and waypoints can be converted directly to GPX format by the GMapToGPX bookmarklet: http://www.elsewhere.org/GMapToGPX/

gpsbabel can do this too, somewhat more indirectly -- the following script shows how:

            #!/bin/sh

            function usage()
            {
                echo usage: $0 "from address" "to address" >&2
                exit 1
            }

            if [ $# != 2 ]
            then
                usage
            fi

            from="$1"
            to="$2"

            # the gpsbabel line simplifies:  the "error=xxx" value is in miles,
            # and signifies how far any single point must be from the straight
            # line connecting its neighbors in order to not be discarded.
            wget -O - "http://maps.google.com/maps?q=$from to $to&output=js" \
                       2>/dev/null  |
                sed -e 's/<b>//g' -e 's/<\/b>//g' |
                gpsbabel -r -i google -f - -x simplify,error=0.05 -o gpx -F -

The above script shows how one might use gpsbabel to simplify a route or track rather than doing it with the Simplify command inside RoadMap. Using gpsbabel might give better results, since it currently uses a different (and more expensive) algorithm than does RoadMap.

Once you have a have a data in GPX format, it's simply a matter of loading that that data with "Open Trip", or merging it into another of your existing trips with "Merge Trip".

### 6.13.4 Quick Destination:

Sometimes one doesn't really want to follow a route at all -- all you want to do is set a goal, and be kept informed of how far away it is, and in which direction. (This might be useful for geocaching, for instance.) That's what the "Quick Destination" menu entry is for. Select where you want to go (a waypoint, a street address, an intersection, or latitude/longitude spot), and as you move around, the display will continously display the distance and direction to that point.

### 6.13.5 Following a route:

A route that has been created or loaded can then be activated. Activating a route defines the departure point (the current GPS location) and enables the "trip display" mode: extra status information will appear on the map. This will include an arrow beside the GPS location symbol to indicate the direction of the next waypoint, as well as user configurable messages, such as distance information, the directions to the next waypoint (if any are present in the waypoint's comments), its distance, etc. The messages will display at the corners of the map. (see CONFIGURATION for more information about these user configurable messages).

If the route's waypoint contains comments (from the "cmt" element of the GPX file), these will be displayed as directions which should be followed when that waypoint is reached. The directions displayed will be from the next waypoint which has directions, i.e. there may intervening waypoints that do not have comments.

A waypoint is "attained" by entering within its "vicinity". This radius is set in the user's' trip preferences (125 ft, by default). When entering the vicinity circle, the GPS directional arrow will immediately begin pointing at the next waypoint in the list. On-screen directions will not be updated (i.e., to describe the next turn, rather than the current turn) until one leaves the waypoint vicinity. In addition, RoadMap honors a larger circle, at twice the size of the waypoint vicinity. If one enters this circle and then leaves it (without ever entering the inner "vicinity-sized" circle), then Roadmap will see if the next route segment is closer than the last route segment, and if so will assume that the user is on track to the next. The directional pointer and on-screen directions will be updated, even though the waypoint was never "quite" attained. This helps accomodate small map errors, or large roundabout or interchange intersections where the actual waypoint may be unreachable.

A route can be stopped at any time and then resumed. When a route is resumed, the waypoint chosen as the "next" to be visited is chosen by searching for the route segment that is closest (in geometrical terms) to the GPS location. The route can also be resumed in reverse mode: in that case the departure point and the destination point switch roles. The reverse mode makes it possible to use the same RoadMap route on the way back, though as noted previously, any comments on the waypoints that give directions will be unchanged. This can be a bit confusing sometimes!

When a route is active, RoadMap tracks the GPS position in realtime and updates the map accordingly. The GPS position can be shown in two modes: either North up or GPS direction up depending on the "Map.DynamicOrientation" preference item. In the second case, the map is rotated according to the direction information received from the GPS, and is convenient as it matches the driver's or passenger's view. (This dynamic rotation is in addition to the map manual rotation.) Some people find it disconcerting, however, and will wish to retain "North up" mode.

## 6.14 CURRENT TRACK

Unless specifically disabled in preferences, the GPS track followed by the user will be continuously recorded by RoadMap. By default this "breadcrumb trail" will be displayed on the map, but this can be suppressed with the "Show/Hide Track" toggle command. Whether the track is displayed initially is also configurable.

The frequency at which points for the track are recorded is determined by several settings in preferences:

- If "Time" is chosen, then track points will be saved periodically every so many seconds (as long as the GPS has moved at least a little bit).
- If "Distance" is chosen, then a new track point will be saved whenever the configured distance from the previously saved trackpoint has been exceeded.
- IF "Deviation" is chosen, then a new track point will only be saved if the new point is the configured distance "off track" from the preceding path of travel. This minimizes the points saved, since straight line travel is represented by very few points. [ Currently unimplemented. ]
- If "Off" is chosen, then no track points will be saved.

Normally the recorded track will be saved in the configured filename. The default for this file is "currenttrack.gpx". If one wishes to record tracks, but never save them to disk, set the filename to the special value "NONE".

## 6.15 DRIVERS

RoadMap can interface with the outside world through separate driver applications. A driver can:

- Receive the current GPS position from RoadMap.
- Access the RoadMap preferences database.
- Provide RoadMap with objects to track and update each object's position, speed and steering (otherwise called "position").
- Communicate with another application to export RoadMap's position or import the position of objects as reported by the other application.

The objects reported to RoadMap have the following attributes:

- An unique ID used to identify the object within RoadMap.
- A name used for (future) display.
- The name of a sprite used to represent the object on the screen.
- A position, speed and steering.

All drivers must be listed in the text file ~/.roadmap/drivers. This file contains one line per driver, with the following syntax:

           <name> : <command>

The command may have any number of parameters (or none). The program must be specially designed to interact with RoadMap: do not just use any program as a RoadMap driver.

Once a driver has been declared in the drivers file, it can be enabled or disabled by changing the Drivers.driver preference item. By default, all newly declared drivers are disabled. A disabled driver is known to RoadMap, but is not started. Multiple drivers can be enabled at the same time, however some drivers may not be designed to be started more than once.

RoadMap comes with 3 drivers:

- rdmghost is the driver test program. It is a silly small application that echoes back a previous position of RoadMap. It shows a green ghost vehicle that seems to chase the RoadMap position. The rdmghost driver uses the Ghost.Delay preferences items, which sets the delay for echoing the RoadMap location (each delay unit generally match one second time).
- rdmfriends is the driver for the gpsdrive's friends protocol. It can connect to a friends server (gpsdrive 2.0.9), advertise the RoadMap location and provide RoadMap with the list and location of all vehicles known to the friends server. The rdmfriends driver use the Friends.Name and Friend.Server preferences items. The first item provides the name that rdmfriends must use to identify itself to the friends server. The second item provides the network address of the friends server.
- rdmkismet is the driver for the kismet wireless network scanner. This driver connects to the kismet application and provide RoadMap with the list and position of access points kismet is detecting (the speed represent the signal strength and the steering represents the channel). The rdmkismet driver uses the Kismet.Server preferences items that specifies the network address of the kismet application.

These three drivers were designed so each can be started more than once: the option --driver=name replaces the default driver's name (repectively Ghost, Friends and Kismet) with the specified name. This changes the category of the driver's preferences items as well. It is thus possible for RoadMap to interact with multiple friends servers or kismet scanners.

For example, the following drivers file declares 2 ghost drivers:

          Ghost1: rdmghost --driver=Ghost1
          Ghost2: rdmghost --driver=Ghost2

## 6.16 ROADMAP PREFERENCES

It is possible to edit the roadmap's preferences (select File/Preferences from the menu bar). Most preference items take effect only when roadmap start, so quitting roadmap is usually required. Editing the roadmap preferences requires a keyboard to be available. One way to configure the iPAQ preferences is to run roadmap from the iPAQ, redirected to the desktop's or laptop's X server.

# 7 USING ROADGPS

The RoadGps tool can be started on its own (using command line options similar to those of RoadMap), or from the RoadMap's File / GPS Console menu item.

The screen shows the list of satellites, their position in the sky (north up) and the strength of the signal. It marks in reverse video those satellites used to compute the current position.

More importantly, RoadGps allows to log all the NMEA sentences received. RoadGps rotates through up to 127 log files. The log file are created in /var/tmp, with the name formatted as: "roadgps-%d.log" (where %d represents an integer in the range 1..127).

This log file can be replayed in RoadMap using the --gps option with an absolute file name as an argument. For example:

           roadmap --gps=/var/tmp/roadgps-1.log

When RoadGps starts, the logging function is off. Whenever the logging function is turned on a new log file is created (if the logging function was already on, the current log file is closed and a new one is created).

RoadGps uses a subset of the RoadMap preferences setup, but has no preferences editor of its own: configure RoadMap first, and then use RoadGps.

# 8 CONFIGURATION

This section describes the files used to configure RoadMap on the local machine. In most cases these files contain user-defined data that defines the look of the RoadMap user interface, or resources used by RoadMap.

We will first describe where to find these configuration files on the different operating systems that RoadMap supports, then we will describe the content of each configuration file.

The files themselves are the same on all operating systems.

Note that this section does not cover the files describing the maps: there is a clear separation in RoadMap between the map data, which the user normally does not modify or customize, and the configuration data, which the user may want to custimize. The map files are described in a separate section.

The configuration files are stored in a set of directories to allow for a default, system-wide configuration and allow each user to customize the configuration separately. See the INSTALLATION section for more details.

## 8.1 FILES

The syntax of most RoadMap configuration files is similar to the X ressources file format (the exceptions are the sprites file and the trip files). Each configuration item is represented by one line of text, using the following format:

                name ': ' value

The following configuration files are used:

preferences
  User's preferences.
session
  The latest context used (locations)
sprites
  The definition of the graphic symbols
roadmap.toolbar
  (Optional) The actions shown on the RoadMap toolbar.
roadgps.toolbar
  (Optional) The actions shown on the RoadGps toolbar.

The session file contains the state of roadmap, which is saved (if needed) when roadmap exits. The preferences file contains all the preferences items, and can be edited by the user. The schema file describes the geographic entities that are shown on the map; it should normally not be modified by the users. The sprites file contains the graphical definition of the symbols usd by RoadMap to indicates the various locations, to draw the compass, etc..

The toolbar files define the content of the RoadMap and RoadGps toolbars. See the section CONFIGURING THE MENUS AND TOOLBAR for more information.

## 8.2 CLASS FILES AND SKINS

The RoadMap configuration also contains the map class files. Each class file describes the organization of one set of map files showing the same list of layers (roads, topography, water feature, etc...).

The class files are stored in a skin subdirectory. It is possible to install multiple sets of class files by creating multiple skin subdirectories and then select the active skin in the user preference. The default skin is named, well, default.

The class files are described in more details in the MAP FORMAT section.

(Note that the class files replace the old schema file, which is no longer used.)

## 8.3 CONFIGURING THE TEXT AND VOICE MESSAGES

The RoadMap text displays and voice messages can be configured by the user using format strings in the preferences. The format strings contain static and dynamic parts. The dynamic parts (or "macros") are specified using the character '%' followed by one character that denotes a predefined RoadMap variable.

A: | estimated time of arrival (not yet implemented).
B: | Direction of travel (bearing).
C: | the name of the city for the selected or current street.
D: | Distance to the destination (set only when a trip is active).
E: | Next sunset time (evening), undefined in night time.
e: | Next sunset time, always defined.
F: | the full name (number, name, city) of the selected or current street.
H: | Altitude.
M: | Next sunrise time (morning), undefined in daylight time.
m: | Next sunrise time, always defined.
N: | the name of the selected or current street.
P: | the name of the selected or current place.
R: | the name of the route or list containing the selected place.
S: | Speed.
T: | Current time, format HH:MM.
W: | Distance to the next waypoint (set only when a trip is active).
X: | Directions to be followed when the next waypoint (with directions) is reached. (set only when a trip is active).
Y: | Distance to the next waypoint which includes directions, unless the GPS is "at" that waypoint. (set only when a trip is active).
#: | the street number range to the selected or current street block.
x: | Distance from one side of the screen to the other.
y: | Distance from the top to the bottom of the screen.

Note that the time is always shown using the military format: HH:MM.

Example: "%D (%W)" shows the distance to the destination point, followed by the distance to the next waypoint (in parenthesis).

A message is evaluated, and displayed, only when all referenced macros have a defined value. Therefore the example above will show nothing if there is no trip active, or if there is no next waypoint. It is possible to define several alternatives, separated by the character '|': the first alternative that has been successfully evaluated will be displayed.

Example: "%D (%W)|%D" shows both distances to the destination point and to the next waypoint if both distances are defined, or else only the distance to the destination point if this distance is defined. If none of the two distance have been defined (for example when no trip is active), then no display is shown and/or no sound is produced.

Likewise, "In %Y, %X|%X" will say something like "In 0.5 miles, Turn Right", unless you're already at the point at which you should turn right. Then it will just say "Turn Right".

Another typical example is "sunset: %E|sunrise: %M", which shows the next sunset (in daylight time) or sunrise (in night time).

It is possible to "link" together parts of a string using simple or double quotes. This is used when the string specifies an external command to execute. RoadMap does not use the shell to execute commands (so to stay independent from the OS-specific shell syntax), but it does recognise the use of quotes to specify a command parameter that includes spaces. Such a parameter may be enclosed in single or double quotes. There is no difference between one quote or another, except that the parameter must be terminated with the same quote character it was started with.

Example: "flite -t 'On %N'" to specify the command flite with two parameters ("-f" and "On %N").

## 8.4 CONFIGURING THE MENUS AND TOOLBAR

The items shown in the RoadMap and RoadGps menus and toolbars can be redefined by the user in text configuration files. Note that each program comes with a built-in menus and toolbar configuration that serves as the default, so none of these configuration files is required to be present for RoadMap or RoadGps to work. In fact, RoadMap is distributed with none of the configuration files described in this section. (Example files are provided for RoadMap, but are not installed automatically.)

It must be realized that making any change to the menus and the toolbar comes at a price: this documentation was written using the standard user interface. Modifying the user interface is likely to make this documentation even more confusing than it originally is.

The major reason for customizing the menus or the toolbar is to let the user tailor the toolbar to fill small screens (such as a PDA) with his preferred controls at the most convenient place. Using a GUI in a car or on a bike is challenging enough.

The configuration files are organized with one entity per line. An entity is either the title of a menu, the name of an action, a separator or a comment.

Each menu is described by it's title (prefixed with character '/'), followed by the list of items in that menu. The title of a menu is a user-defined string with a maximum length of 254 characters (it is recommended to select short titles made of a single word, however). There is no such title line for toolbars: all menu title lines will be silently ignored. The toolbar is organized as a single, anonymous, menu.

Each menu or toolbar item is described by its action name. A separator is described by the character '-'. There must be only one item (title, action name or separator) per line. Empty lines are authorized and lines starting with the '#' character are treated as comments.

There are two sorts of menus. All menus are available as popup menus, which are invoked either in response to an event (as specified in the preferences "Events" section), or by being invoked from a menu entry or toolbar button. In addition, menus that are specified as menubar menus will appear in the menu bar. Invoking a popup menu from another menu is how submenus are implemented in RoadMap.

The menus, popup and toolbar configuration files for roadmap are named "roadmap.menus", "roadmap.popup" and "roadmap.toolbar", respectively. The same configuration files for roadgps are named "roadgps.menus", "roadgps.popup" and "roadgps.toolbar". These files must be stored in the same places as other RoadMap configuration files.

By default, a long click of mouse button 1 will bring up the menu called "/Long Click Popup" in roadmap,gps.popup, and a right click (button 3) will bring up the menu called "/Right Click Popup". These bindings can be changed by setting "Events:Long Click" or "Events:Right Click" in the preferences.

There is a different list of possible actions for RoadMap and RoadGps. The list of valid action names can be obtained using the command line option --help=actions:

            roadmap --help=actions
            roadgps --help=actions

The following is an example of a menus definition file for RoadMap:

           /Right Click Popup
           preferences
           gpsconsole
           -
           quit
           /Help
           about

The following is an example of a toolbar definition file for RoadMap:

            full
            quit
            -
            destination
            location
            gps
            hold
            -
            zoomin
            zoomout
            zoom1
            ->Help...

The last item in the toolbar file example will invoke the "Help..." menu.

It's actually possible to configure RoadMap with no on-screen buttons or menus at all. By creating an empty "roadmap.menus" file, the internal menubar menus will be suppressed. Then, configure the Long or Right Click action to invoke the "Menus..." menu. This special popup contains the same list of menus that would normally appear in the menubar. This allows full access to RoadMap commands, all via the mouse. More practically, one might wish to bind the "->Menus..." popup menu to a toolbar button -- then RoadMap could run with a toolbar, but no menubar.

It is also possible to rename the RoadMap actions, with the effect of changing the labels used in the menus and the text of the tooltips. Why one would want to rename actions? Some poor souls have expressed their disapproval of this author's choice of labels and help texts. More seriously, some small screens do require short labels, while longer labels are better on large screens. Since one size does not fit all, we let you, the user, have the last say on this matter.

The renaming mechanism is based on the same actions as the menus and toolbar customization (see above).

The translations are described in text files, one text file per program: "roadmap.actionlabels" for roadmap and "roadgps.actionlabels" for roadgps. These files should be located in the usual RoadMap configuration places.

Each action is renamed using one line of text that contains the action name, its menu label, its toolbar label and its tip label (in that order). Each of these items is separated by one special character. This separator can be any character except a letter (upper case or lower case) or a digit ('0' to '9'). Different separators can be used on different lines, but the separator must stay the same until the end of the line.

The following are examples of valid action renaming lines (from English to French, to please our Canadian friends):

          mutevoice;Silencieux;S;Desactive la synthese vocale
          enablevoice+Volubile+V+Active la synthese vocale
          quit,Quitter,Q,Quitter l'application

Remember that the toolbar labels should be very short, since the toolbar has a limited size.

Please note that, contrary to the example above, this renaming is not intended to provide a general mechanism for the internationalization of RoadMap. This would be a very crude translation mechanism, as it is very incomplete (for example, dialogs are not translated).

In fact, this renaming mechanism is likely to conflict with a future internationalization effort, and might be removed in later releases.

## 8.5 CONFIGURING ON-SCREEN OBJECTS

RoadMap can display small images on the screen (on-screen objects) which can reflect the state of the program (e.g., which way is north, how strong is the GPS signal), and/or allow actions to be performed (e.g. zoom in, show the trip's destination). These objects may be placed anywhere on the screen, but nothing prevents them from being obscured by other popup messages and displays, so their position is usually along the sides of the screen.

The position, display, and actions associated with these objects are controlled by a "roadmap.screenobjects" file. The distributed copy of this file contains definitions for a small compass image, a map download indicator, zoom in and zoom out control points, and some arrow indicators which help point the way when following a route. The user is free to make a local copy of this file in order to add on-screen command points, and to customize the display in general.

The roadmap.screenobjects file is made of a sequence of single-line commands. The "sprites" referred to in this description are defined in the configuration file named "sprites", described in the "SPRITES FILE" section of the documentation.

N name | Name of the object (unused, but starts a new object)
P x y | The screen position of the sprite, measured from the top left in pixels. Negative offsets measure from the right and from the bottom. If the x or y value begins with a 'C', then the remainder is an offset from the center of the screen.
E sprite | The name of the sprite which will be drawn.
E sprite | Multiple sprites can be specified. Which one is displayed is selected via the object's "state" indicator.
S statename | The "state" indicator which will choose among the listed sprites. For "constant" displays, this is optional.
A actionname | The action which should be invoked when the sprite is selected. Optional. The action can be a simple action name, or, when prefixed with "-->", the name of a popup menu which should be invoked.
R | Sprites will normally rotate, either with the screen, or based on an angle retrieved via the state indicator. Specifying 'R' suppresses this by forcing rotation to the given angle.
B x y x y | Optional -- the bounding box used to determine whether a selection has taken place. (I.e., the size of the sprite.) Normally the bounding box is calculated by RoadMap itself (and if the object will rotate, the bounding box is forced to have maximal dimensions), but irregularly shaped sprites, combined with the rotation of the sprite, may require that the box be overridden.

The screen objects can display different sprites to indicate the state of various internaly RoadMap runtime states. These state indicators are referenced by name, and are linked to the screen object via the 'S' descriptor in the "roadmap.screenobjects" file.

The possible state indicators are as follows. Most have just two possible "return values", but some can represent more than two state values. In addition, any can optionally return an angle which can influence the display of the sprite.

get_download_enabled | Indicates whether the user has enabled map downloads.
get_GPS_reception | Four possible states, indicating current GPS performace: N/A, none, poor, and good.
zoom_reset | Indicates whether zoom is at the default level.
view_mode | Indicates 2D or 3D map rendering.
get_orientation | Indicates whether map rotation is fixed or dynamic. Also returns the current angle of the map relative to north. (This is what drives the on-screen compass object.)
get_direction_next | When following a route, indicates the direction to the next waypoint. This indication is relative to the direction of travel -- i.e., it points correctly if the user holding the display is facing forward in the vehicle.
get_direction_2nd | As above, but points to the waypoint after the next.
get_direction_dest | As above, but points to the final destination.

## 8.6 A NOTE REGARDING COLORS

Some RoadMap configuration items define colors to be used. As a general rule a color must be described in a way that is suitable for the target graphic system.

In the case of X11, that means either a color name (as defined in the /etc/X11/rgb.txt) or a color definition: #rrggbb where rr, gg and bb are hexadecimal values (for example: #FFFFFF is white, #000000 is black).

Note that the #rrggbb format is broadly supported, even on target systems that do not support named colors.

## 8.7 PREFERENCE ITEMS

General.Unit
  The unit system used, either "imperial" or "metric"

  Default: imperial

General.Default Zoom
  The zoom level when roadmap is started.

  Format: integer

  Default: 60

General.Keyboard
  Show (yes) or hide (no) a keyboard on the screen.

  Format: boolean

  Default: yes

General.Icons
  Show (yes) or hide (no) the roadmap icons.

  Format: boolean

  Default: yes

  Command line option: --no-icon

General.IconPath
  The icon search path.

  Format: a comma-separated list of directory paths.

  Default: see the ICON FILES section of this document.

  Comment: the hardcoded default includes the usual linux system pixmap directories used for storing application icons.

General.Toolbar
  Show (yes) or hide (no) the roadmap toolbar.

  Format: boolean

  Default: yes

  Command line option: --no-toolbar

  Comment: in some case (GTK2) it may be necessary to suppress or minimize the toolbar if a very small screen is needed, because the size of the toolbar may dicate the minimum size of the screen.

General.Toolbar Orientation
  Choose where to position the toolbar

  Format: "Top", "Bottom", "Left" or "Right"

  Default: system default toolbar position (usually on top).

General.Tooltips
  Show (yes) or hide (no) tooltips on menus and buttons.

  Format: boolean

  Default: yes

  Comment: Tooltips may not work well on a touchscreen device.

General.UserPath
  Directory for per-user configuration.

  Format: a directory path, usually starting with '~'

  Default: ~/.roadmap

  Comment: This directory can be referred to in other RoadMap path specifications using the shortcut '&'.

General.TripsPath
  Directory in which trips are stored, usually per-user.

  Format: a directory path

  Default: &/trips, i.e. in ~/.roadmap/trips

  Comment: Trips files can be stored anywhere, but in some places RoadMap makes it easier if they're stored here. New trips, unnamed by the users will be stored here.

Geometry.Main
  Sets the size of the RoadMap main window.

  Format: WIDTHxHEIGHT

  Default: 800x600

Geometry.Default
  Sets the default size for other RoadMap windows.

  Format: WIDTHxHEIGHT

  Default: 300x200

Geometry.WINDOW
  Sets the size of the RoadMap window named WINDOW.

  Format: WIDTHxHEIGHT

  Default: the value of Geometry.Default

Display.Bottom Right
  Defines the message on the bottom right corner.

  Format: RoadMap format string

  Default: %D (%W)|%D

Display.Bottom Left
  Defines the message on the bottom left corner.

  Format: RoadMap format string

  Default: %S

Display.Top Right
  Defines the message on the top right corner.

  Format: RoadMap format string

  Default: In %Y, %X|%X");

Display.Top Left
  Defines the message on the top left corner.

  Format: RoadMap format string

  Default: empty

Display.Duration
  The time during which a selection or message is shown.

  Format: number of seconds.

  Default: 10

  Comment: the selection is only removed when the map is redrawn.

Display.Refresh Period
  Minimum interval between display refreshes.

  Format: integer (milliseconds)

  Default: 200

Display.Font Size
  The size of the text used for labeling.

  Format: integer (pixels)

  Comment: Currently only honored if the internal "linefont" is being used.

Help.Browser
  The browser program used to show the help text.

  Format: a program name, with or without path.

  Default: dillo

Help.Arguments
  The browser's command line arguments

  Format: a format string, with one '%s' for the help URL.

  Default: %s

Map.Path
  The map database search path.

  Format: a comma-separated list of directory paths.

  Default: empty string (i.e. RoadMap uses the hardcoded default)

  Comment: the hardcoded default also includes the directories /usr/local/share/roadmap and /usr/share/roadmap, for compatibility purposes. These two directories were the standard locations for the maps in previous versions of RoadMap. Maps can be located in any directory mentioned in this path. RoadMap will only consult a single usdir.rdm file at a time, even if more than one is present in the Map.Path directories.

Map.Cache
  The number of entries in RoadMap's mapping cache.

  Format: integer

  Default: 8

  Comment: This value controls how many maps RoadMap will keep "open" at once, for faster access.

Map.Background
  The color used for the background of the maps.

  Format: color

  Default: LightYellow

Map.Labels
  Enable/disable the initial display of street names.

  Format: boolean

  Default: yes

  Comment: chooses whether streets are labeled at startup. They can still be toggled by command.

Map.DynamicOrientation
  Rotate the map to match the GPS direction.

  Format: boolean

  Default: off

  Comment: chooses whether the map will initially show north, or the direction of travel, towards the top of the screen. Can be toggled by command as well.

Map.GPS map offset latitude
  Allows tuning of GPS latitude results.

  Format: integer

  Default: 0

  Comment: offset (millionths of a degree) applied to GPS results

Map.GPS map offset longitude
  Allows tuning of GPS longitude results.

  Format: integer

  Default: 0

  Comment: offset (millionths of a degree) applied to GPS results

Map.Signs
  Enable/disable the map sprites and street signs.

  Format: boolean

  Default: yes

  Comment: use only in special cases (very small screens)

Map.Refresh
  Forces a screen refresh every time.

  Format: enumeration (normal / forced)

  Default: normal

Map.Use Linefont
  Enables use of the internal linefont.

  Format: enumeration (off / labels / signs / all)

  Default: labels

  Comment: The internal line font may be preferable to the system font since it can draw at angles, and since its size can be easily scaled. It is not very pretty, however.

Labels.MinFeatureSize
  The shortest street which may be labeled.

  Format: integer (in pixels)

  Default: 25

Labels.Color
  The color used when labeling streets.

  Format: color

  Default: Black

Labels.Font Size
  The size of the text used for labeling.

  Format: integer (pixels)

  Comment: Currently only honored if the internal "linefont" is being used.

Landmarks.Name
  The filename used for storing personal landmarks

  Format: pathname, including & and ~ shortcuts

  Default: landmarks.gpx, in the '&' (~/.roadmap) directory.

Landmarks.Color
  The color used when labeling personal landmarks.

  Format: color

  Default: dark red

Landmarks.Font Size
  The size of the text used for labeling.

  Format: integer (pixels)

  Comment: Currently only honored if the internal "linefont" is being used.

Track.Name
  The filename used for storing current "breadcrumb" track

  Format: pathname, including & and ~ shortcuts

  Default: currenttrack.gpx, in the '&' (~/.roadmap) directory.

  Comment: The file is in stored in GPX format.

Track.Initial Display
  Determines whether the track is displayed when RoadMap starts.

  Format: enumeration (on, off)

  Default: on

  Comment: The display can still be toggled by command.

Track.Policy
  The algorithm used to decide when to store a new trackpoint

  Format: enumeration ("off", "Deviation", "Distance", "Time")

  Default: off

  Comment: When "off", no track is recorded. When set to "Time", a new trackpoint is stored after "Track.Time Delta" time has passed since the last point was recorded. Shen set to "Distance Delta", a new point is stored when the user has moved Track.Distance from the last point. "Deviation" is the optimal setting: call the most recent three points A, B, and C. Point B is dropped if the distance from A to B and then to C is approximately equal to the distance directly from A to C.

Track.Time Delta
  Time interval used when Track.Policy is "Time".

  Format: integer (seconds)

  Default: 15

Track.Distance Delta
  Distance used when Track.Policy is "Distance".

  Format: integer (with units)

  Default: 100 m

Track.Autosave minutes
  Number of minutes between automatic saves of the current track.

  Format: integer

  Default: 1000

Track.Saved Track Points
  Approximate number of track points saved in memory, or in a single file.

  Format: integer

  Default: 1000

  Comment: After "Track.Autosave minutes", if there are 25% more points in the current track than this number, then 75% are saved to an archive file, and the remainder are still kept in memory and displayed on the map.

Trip.Name
  The filename holding the current trip.

  Format: pathname, including & and ~ shortcuts

  Default: SavedTrip.gpx, in the '&/trips' (~/.roadmap/trips) directory, but usually chosen by the user.

  Comment: The file is in stored in GPX format.

Trip.Show Inactive Routes
  Should waypoints in unselected routes be shown.

  Format: boolean

  Default: yes

  Comment: Can still be toggled by command.

Trip.Show Inactive Tracks
  Should waypoints in unselected tracks be shown.

  Format: boolean

  Default: no

  Comment: Can still be toggled by command.

Trip.Connect Route Points
  Should route waypoints be connected with straight lines?

  Format: boolean

  Default: yes

  Comment: Can still be toggled by command.

Trip.Route Connect Color
  The color used to connect route waypoints.

  Format: color

  Default: red

Trip.Waypoint Radius
  How close does the GPS need to be to a waypoint to be "on" the waypoint.

  Format: integer (distance, with units)

  Default: 125 ft

FeatureFiles.Path
  List of files containing "Point of Interest" features to display on map.

  Format: A comma-separated list of featurefile specifiers. A featurefile specifier is a semi-colon-separated list of display parameters: filename;spritename;labelcolor;labellevel;spritelevel,filename;spritename...

  Default: empty

  Comment: The filename may include & and ~ as path shorthands. The spritename should appear in the sprites file. The labelcolor will be used when writing the feature's name. The label and sprite levels are integers, representing the zoom level above which the label or sprite, respectively, will not be drawn. Either the sprite name or the label color may be the string "NONE", which will suppress the sprite or the label, respectively. Either declutter level may be omitted.

Files.Make Backups
  Enable/disable the creation of backup files.

  Format: boolean

  Default: yes

  Comment: On UNIX, backup files will have a '~' character appended. Under Windows, a ".bak" suffix will be used.

GPS.Background
  The background color for the RoadGps screen.

  Format: color

  Default: LightYellow

  Comment: this color is used by RoadGps, not by RoadMap.

GPS.Foreground
  The foreground color for the RoadGps screen.

  Format: color

  Default: Black

  Comment: this color is used by RoadGps, not by RoadMap.

GPS.Timeout
  A timeout for detecting that the GPS link is down.

  Format: number of seconds.

  Default: 10

  Comment: the GPS link is considered down if no new GPS data was received for the specified amount of time.

GPS.Source
  The URL that gives the address of the GPS data source.

  Format: protocol:description

  Default: gpsd://localhost

  Comment: The gpsd protocol (gpsd://hostname[:port]) uses the NMEA raw mode of gpsd, while the gpsd2 protocol (gpsd2://hostname[:port]) uses the gpsd native protocol. The object protocol (object:id) makes it possible to use an internal RoadMap object as GPS source (so that a driver can feed the GPS position to RoadMap). The file protocol (file://path) is also possible, for debug. If gpsd is not available, one can use a GPS source connected directly to a serial port. (tty://device-path[:baudrate]) An example would be "tty://dev/ttyS0", or "COM1:" under Windows. 4800 baud is the NMEA standard, but a different speed can be given: "tty://dev/ttyS0:19200". (Note that using direct tty access prevents one from running both RoadMap and RoadGps at the same time, since there is no mechanism in place to allow sharing the serial port. Using gpsd is recommended.)

GPS.Baud
  The baud rate to use if GPS.Source is a serial port

  Format: integer

  Default: 4800

GPS.Color
  The color used for the current GPS position symbol.

  Format: color

  Default: green

  Comment: this color is used by RoadMap, not by RoadGps.

Destination.Color
  The color used for the destination symbol.

  Format: color

  Default: red

Selected Street.Background
  The color for the background of the selected street name.

  Format: color

  Default: yellow

Selected Street.Foreground
  The color for the foreground of the selected street name.

  Format: color

  Default: black

Selected Street.Text
  The format used for the selected street's display.

  Format: RoadMap format string

  Default: %F

Console.Background
  The color used for the background of the trip display.

  Format: color

  Default: yellow

Console.Foreground
  The color used for the foreground of the trip display.

  Format: color

  Default: black

Current Street.Background
  The color for the background of the current street's name.

  Format: color

  Default: DarkSeaGreen4

Current Street.Foreground
  The color for the foreground of the current street's name.

  Format: color

  Default: white

Current Street.Text
  The text used to display the current street's name.

  Format: color

  Default: black (I would recommend using white--see above)

  Default: %N, %C|%N

Voice.Current Street
  The command used to announce the current street's name.

  Format: RoadMap format string

  Default: flite -t 'On %N'

Voice.Selected Street
  The command used to announce the selected street's name.

  Format: RoadMap format string

  Default: flite -t '%N'

Voice.Next Intersection
  The command used to announce the name of the next intersection.

  Format: RoadMap format string

  Default: flite -t 'Next intersection: %N'

Voice.Approach
  Reserved for future use (approaching waypoint).
Accuracy.Confidence
  The minimum rating for a street to be selected

  Format: integer, range 0 .. 1024

  Default: 25

  Comment: RoadMap uses fuzzy logic to identify what street the vehicle is on. This value if a minimum fuzzy result for RoadMap to select any street. This helps not selecting whatever street is near by when off-road. This also speeds up the identification process by filtering out unlikely matches.

Accuracy.GPS Position
  The GPS's estimated position error (worst case)

  Format: distance

  Default: 30m

  Comment: This default accuracy can be adjusted to the actual GPS estimate if a Garmin GPS receiver is used.

Accuracy.GPS Speed
  GPS's speed accuracy.

  Format: integer (ft/s or m/s depending on the current unit system).

  Default: 4

Accuracy.Minimum drag
  The minimum movement required to initiate a drag.

  Format: integer (pixels)

  Default: 5

Accuracy.Mouse
  The size of the street or place selection search area.

  Format: number of pixels

  Default: 20

  Comment: on a mouse click, RoadMap defines the street search area as the rectangle delimited by the two points (x-accuracy, y-accuracy) and (x+accuracy, y+accuracy). Limiting the search to this area speeds up the process, compared to searching in the whole screen area.

Accuracy.Street
  The street selection accuracy.

  Format: integer (using the current unit system).

  Default: 150

  Comment: This is the maximum distance to a street for the navigation logic. If a street is at a distance greater than this value, then RoadMap will never consider this street when searching which street the vehicle is on.

History.Depth
  The maximum number of items in the find history.

  Format: integer

  Default: 100

Approach.Background
  Reserved for future use (approaching waypoint).
Approach.Foreground
  Reserved for future use (approaching waypoint).
Approach.Text
  Reserved for future use (approaching waypoint).
Download.Source
  The format used to generate the URL of the source.

  Format: printf() format, which must include the sequence "%05d".

  Default: /usr/local/share/roadmap/usc%05d.rdm

  Comment: this item is either a full path name (starting with a '/') or an URL (such as "file://[...]" or "http://[...]").

Download.Destination
  The path of the directory where to store the downloaded map files.

  Format: string

  Default: &/maps

  Comment: this item must be either a full path name or start with '~' (user home directory) or '&' (RoadMap user's directory).

Style.Use Pretty Lines
  If "yes", roads are shown with all the defined pens (see schema). If "no", roads are shown with the first pen only.

  Format: boolean

  Default: "yes"

Style.Pretty Lines when Dragging
  If "yes", roads are shown with all the defined pens when dragging (if enabled--see above). If "no", roads are shown with the first pen only while dragging.

  Format: boolean

  Default: "yes"

Style.Show Objects when Dragging
  If "yes", objects are shown when dragging. If "no", objects are not shown while dragging. Objects are the sprites, text messages, etc..

  Format: boolean

  Default: "yes"

## 8.8 SESSION ITEMS

Location.Position
  The latest selected position.

  Format: longitude ',' latitude.

  Default: -122394181,37794928

  Comment: the name of this item is kind of silly, to be changed.

  Command line option: --location=LONGITUDE,LATITUDE

GPS.Position
  The latest received GPS position.

  Format: longitude ',' latitude.

  Default: -122394181,37794928

GPS.Direction
  The latest received GPS direction.

  Format: degrees

  Default: 0

Selection.Position
  The position of the latest selection.

  Format: longitude ',' latitude.

  Default: -122394181,37794928

Address.Position
  The position of the latest address used.

  Format: longitude ',' latitude.

  Default: -122394181,37794928

Trip.Name
  The name of the last used trip file.

  Format: string

  Default: default

Delta.X
  The horizontal map shift compare to the reference position.

  Format: number of pixels

  Default: 0

Delta.Y
  The vertical map shift compare to the reference position.

  Format: number of pixels

  Default: 0

Delta.Rotate
  The rotational shift compare to the reference direction.

  Format: degrees.

  Default: 0

General.Zoom
  The current zoom level.

  Format: number

  Default: see the default zoom preference item.

Focus.Rotate
  Indicate if the current map focus is set to rotate.

  Format: boolean (1 or 0)

  Default: 0

Focus.Name
  Name of the reference position where the focus should be set.

  Format: either "GPS", "Location" or "Address"

  Default: "Location"

Navigation.Enable
  Defines if the roadmap navigation function is enabled.

  Format: boolean

  Default: "yes"

Voice.Mute
  Defines if the voice function was muted by the user.

  Format: boolean

  Default: "no"

Hold.Direction
  An artefact of saving the context. Ignored.
Hold.Position
  An artefact of saving the context. Ignored.
Log.Path
  Last selected path for the RoadGps log files.

  Format: a directory path.

  Default: /var/tmp

Events.Right Click
  The name of the menu to open on a mouse right click.

  Format: string

  Default: Right Click Popup

Events.Long Click
  The name of the menu to open on a mouse long click.

  Format: string

  Default: Long Click Popup

(*) NOTE: the default position values match 1 Market St, San Francisco, CA.

## 8.9 SCHEMA ITEMS

The schema file uses the same format as the preference file. It defines the properties of the various categories of objects that make a map. the list of categories matches the list of Tiger file's categories (see Tiger's CFCC field) that have been filtered by buildmap.

The two differences with the preferences files are that there is no pre-defined category in RoadMap: categories are defined by the maps (FIXME: this is still to be done--as a temporary hack, the categories have been hardcoded somewhere) and there is no default value.

For each category, RoadMap use the following items:

category.Class:
  the class of object this category belongs to.

  Format: Road, Feature or Area.

  Comment: Road and Feature categories are searched in the "line" table of the map files and drawn as lines. The Road category is searched when a street name is looked for. The Area objects are drawn separatly, as polygons.

category.Color:
  the color used when drawing the objects.

  Format: color

category.Declutter:
  the zoom level from which the objects are hidden

  Format: integer

  Comment: the definition of this item is rather obscure. To be fixed.

category.Thickness:
  the thickness used to draw lines.

  Format: number of pixels

RoadMap uses the following categories:

- Freeways
- Ramps
- Highways
- Streets
- Trails
- Rivers
- Shore
- Hospitals
- Malls
- Airports
- Stations
- Lakes
- Parks
- Sea

## 8.10 SPRITES FILE

This file defines the drawing commands used to draw the various symbols used by RoadMap:

GPS (indicates the current GPS position and direction), Position (indicates the currently selected location), Destination, Highlight (marks the endpoints of a selected street block) and Compass (used to indicates the direction of the North pole).

The sprites file is made of a sequence of single-line commands:

S name | Starts a sprite.
A name | Defines the current sprite as an alias of the specified sprite.
F color thickness | Define the pen to be used by the subsequent drawing commands.
L x,y .. | Draw a line.
P x,y .. | Draw a filled polygon.
C x,y radius | Draw a circle.
D x,y radius | Draw a disk (filled circle).
B x,y x,y | Optional -- the bounding box used to determine whether a selection has taken place, when a a sprite is in use as an on-screen object (in "roadmap.screenobjects"). Normally the bounding box is calculated by RoadMap itself, but irregularly shaped sprites, combined with the rotation of the sprite, may require that the box be overridden.

The coordinates are pixel positions, relative to the sprites "hot point".

An S command must appear before any alias or drawing command.

A sprite cannot contain both an alias command and drawing commands. In addition, if an alias command is present, it is the only command defining this sprite (i.e. an alias sprite is defined by just one S and one A command). For example:

         S Friend
         A GreenTriangle

         S GreenTriangle
         F white 2
         L 0,0 7,14 0,8 -7,14
         F DarkGreen 2
         L 0,1 6,13 0,10 -6,13 0,1

A sprite alias is just another name for the referenced sprite: an alias will be visually identical to the sprite it references. An alias command can reference a sprite that is itself an alias. There is no limit to the depth of the alias chain, but circular references are illegal, and detected. Forward references are legal, i.e. the sprite referenced in an alias command can be defined later in the file.

One reason for using alias sprites is to make it simpler to redefine sprites known to RoadMap (such as "Direction" or "Destination"). The alias mechanism has a negligible fixed cost at runtime: using multiple alias levels will have no practical impact on RoadMap performances.

## 8.11 TRIP FILES

RoadMap trip data is stored in GPX format. More about the widely-used GPX data format can be found at:

http://www.topografix.com/gpx.asp

The main thing to know about this format is that a GPX file may contain one or more "routes", one or more "tracks", and one or more "landmarks".

Routes and tracks are very similar: it's most useful to think of a route as "where you want to go", and a track as "where you've been". Routes are usually "composed", either manually or using navigation software. Tracks are usually recorded, by making a note of one's GPS location periodically. (By the way, tracks don't get included into trip files automatically. If you wish to store your tracks along with your routes for a given trip, you'll need to save copies of your current track and them to the trip.)

Routes and tracks are both composed of "waypoints". To reduce confusion, RoadMap tries to use the term "waypoint" to _only_ refer to points which are contained in routes and tracks. Points that are unassociated with a specific route or track are called "landmarks". If you read the GPX documentation you'll find that everything is called a waypoint.

Waypoints simply represent a place, along with some other information about that place. For instance, a waypoint in a route might have a name, and it might also have a comment attached to it which says which way to turn when this waypoint is reached. A waypoint in a track might only contain its location and the time at which you were there. The landmarks in the trip file might represent places of interest which, while not really part of a route, are related to the trip somehow.

Here are some more details regarding how RoadMap uses the GPX format.

Waypoints (and landmarks):

name is used directly if available.

If no name is available, a shortened version of the cmt or description element will be used instead. If neither of these elements is available, a name will be generated.

In addition, if no cmt is available, the description element will be used as a description.

The sym element will be used as the sprite name, if it is set, otherwise fixed RoadMap defaults will be used for the spritename, depending on what sort of waypoint it is.

When generating a waypoint while recording a track, RoadMap will set the ele, speed, course, and time elements, as well as the "lat" and "lon" attributes. All of this data comes directly from the GPS. The name and sym elements are left unset.

Routes and Tracks:

The name and desc elements will be used and set. For tracks, the trkseg level of the hierarchy is ignored -- all track segments are treated as one.

The following trip file example contains just one route, which goes from the Golden Gate's bridge to 1 Market St, in san Francisco, California. It also contains the locations of some nearby pizza parlors:

        <?xml version="1.0"?>
        <gpx version="1.1">
           <rte>
              <name>198 Richardson Ave to 1 Market St</name>
              <rtept lat="37.8003" lon="-122.44703">
                 <cmt>Head southeast from Richardson Ave</cmt>
              </rtept>
              <rtept lat="37.79879" lon="-122.4446">
                 <cmt>Bear left at Lombard St</cmt>
              </rtept>
              <rtept lat="37.79901" lon="-122.44265">
                 <cmt>Turn right at Divisadero St</cmt>
              </rtept>
              <rtept lat="37.78336" lon="-122.43948">
                 <cmt>Turn left at Geary Blvd</cmt>
              </rtept>
              <rtept lat="37.78529" lon="-122.42467">
                 <cmt>Bear right at Ofarrell St</cmt>
              </rtept>
              <rtept lat="37.78678" lon="-122.40458">
                 <cmt>Turn left at Market St</cmt>
              </rtept>
              <rtept lat="37.79444" lon="-122.39487">
                 <cmt>Arrive at destination</cmt>
              </rtept>
           </rte>
           <wpt lat="37.792612" lon="-122.393843">
              <name>Village Pizzeria</name>
           </wpt>
           <wpt lat="37.793392" lon="-122.397554">
              <name>Parkway Pizza</name>
           </wpt>
           <wpt lat="37.789001" lon="-122.394843">
              <name>Dogzilla Cafe</name>
           </wpt>
        </gpx>

In addition to the trip files, there are two other important files which are also stored in GPX format.

The "Personal Landmarks" files, called "landmarks.gpx" by default, contains landmarks (waypoints) which you might want to keep handy no matter what trip file you have loaded. Examples might include your home, your office, your hairdresser, etc. When writing this file, only the personal landmarks are written. When reading, only the unassociated waypoints are read -- any routes or tracks in the file are ignored.

The "Current Track" file contains waypoints representing where you've been -- a "breadcrumb trail", if you will. This file (called "currenttrack.gpx" by default) will only contain a single track when written. When read (on startup, to restore previous state), only the first track in the file will be read. All other routes or tracks and waypoints will be ignored (and likely lost, when the current track is saved at the end of the session). Along with the currenttrack.gpx, you may see "recenttrack.csv", and one or more "savetrack-*.gpx" files (which will include a date in their names). The "savetrack" files are archival -- if the in-memory list gets too big, or if the user "clears" the current track, then excess historical trackpoints will be written to a "savetrack" file. A "savetrack" file will also be created if you manually reset the current track -- a backup of its contents is saved, for good measure. The "recenttrack.csv" file is a temporary file, used to keep RoadMap from losing any track points in the event that it dies (crashes) unexpectedly. The goal is to never lose a track point.

(These files are not stored in the same directory as the other trip files, but instead in the same directory in which the user's preferences and session file are found.)

## 8.12 FEATURE FILES

Like the RoadMap trip data, feature data is stored in GPX format. Each feature file should represent a related set of points of interest, like ice cream shops, motels, campgrounds, or mountaintops. A single sprite can be associated with each file, and will be used to represent its contents on the map. Features will be labeled using the pen color specified. Either or both of the sprite and label can be suppressed by specifying the name "NONE". Feature labels and sprites can also be selectively disabled as the map is zoomed out. An example feature file specification, which uses ';' as its delimiter, might be: &/icecream.gpx;ConeSprite;darkblue;350;750 This says that the ice cream shops listed in the given file should be drawn with the ConeSprite, labeled with a "darkblue" pen, the labels should be eliminated above zoom level 350, and the sprites should disappear above zoom 750. Likewise: &/towns.gpx;NONE;black;350;350 says that towns should be labeled in black, with no sprite, up to zoom level 350. If a higher sprite declutter level is specified: &/towns.gpx;NONE;black;350;1000 then a small default sprite (with the name "PointOfInterest") will be shown, up to the higher level.

Multiple file specifications (including each file's associated (and semicolon-separated) sprite name, pen color, and declutter levels) should be separated by ',' characters.

Note that unlike the maps, which are read and cached on an as-needed basis, the feature files are read into memory in their entirety when RoadMap starts, so there is a memory penalty for using large feature files.

# 9 TOOLS

A RoadMap map file is a small database of C tables. The tables are organized in a tree fashion and each table is identified by a path. One specific set of tables (the dictionary) groups all the names that appear in the map.

RoadMap comes with a tool to display information extracted from a map file:

       dumpmap [--usage] [-d TABLE] [--strings] [--volume=NAME] [--search=NAME]

dumpmap uses the popt library for parsing command line argument: the option --help provides a full description of each option. The name of map files must be provided after the options: dumpmap will process each provided file sequentially, according to the options that was selected.

# 10 CONFIGURATION EXAMPLES

~/.roadmap/preferences ("factory" defaults):

    Accuracy.GPS Speed: 4
    Accuracy.Confidence: 25
    Accuracy.Street: 150
    Accuracy.Mouse: 20
    Accuracy.Minimum Drag: 5
    Approach.Background: yellow
    Approach.Foreground: black
    Approach.Text: Approaching %N, %C|Approaching %N
    Console.Background: yellow
    Console.Foreground: black
    Current Street.Background: yellow
    Current Street.Foreground: black
    Current Street.Text: %N, %C|%N
    Destination.Color: red
    Display.Bottom Left: %S
    Display.Bottom Right: %D (%W)|%D
    Display.Top Right: In %Y, %X|%X
    Display.Duration: 10
    Display.Rotate: yes
    General.Default Zoom: 20
    General.Keyboard: no
    General.Toolbar: yes
    General.Icons: yes
    General.Unit: imperial
    Geometry.Main: 800x600
    Geometry.Preferences: 800x300
    GPS.Background: LightYellow
    GPS.Color: red
    GPS.Foreground: black
    GPS.Source: gpsd://localhost
    GPS.Timeout: 10
    History.Depth: 100
    Map.Path: ~/.roadmap,/var/lib/roadmap,/usr/lib/roadmap
    Map.Cache: 8
    Map.Background: LightYellow
    Map.Refresh: normal
    Map.Signs: yes
    Polygons.Declutter: 1300
    Selected Street.Background: yellow
    Selected Street.Foreground: black
    Selected Street.Text: %F
    Shapes.Declutter: 1300
    Voice.Approach: flite -t 'Approaching %N'
    Voice.Current Street: flite -t 'On %N'
    Voice.Next Intersection: flite -t 'Next intersection: %N'
    Voice.Selected Street: flite -t 'Selected %N'

~/.roadmap/session ("factory" defaults):

    Delta.Rotate: 0
    Delta.Y: 0
    Delta.X: 0
    Focus.Rotate: 0
    Focus.Name: Address
    Trip.Name: default.gpx
    Hold.Direction: 0
    Hold.Position: 0,0
    Selection.Position: -122394181,37794928
    Address.Position: -122394181,37794928
    GPS.Direction: 0
    GPS.Position: 0,0
    General.Zoom: 150

# 11 IMPLEMENTATION DETAILS

This section contains additional information for developpers, knowledge that is not required for using RoadMap. It is here to answer some usual questions and help people who want to hack with the RoadMap code.

## 11.1 PORTING ROADMAP

The roadmap and roadgps applications have been designed so to facilitate portability. Two sub-parts of RoadMap have been isolated for that purpose: the graphic user interface and the OS interface.

The graphic user interface is all defined by the following header files:

roadmap_main.h
  The application's main window.
roadmap_canvas.h
  The canvas used to draw the map.
roadmap_dialog.h
  The widget used to build dialogs.
roadmap_messagebox.h
  A pre-built warning/error dialogs.
roadmap_fileselection.h
  A pre-built file selection dialog.

The OS interface is defined by the following header files:

roadmap_net.h
  Isolate socket interface oddities.
roadmap_path.h
  Hides the OS syntax for file path.
roadmap_file.h
  Primitives to access and map binary files.
roadmap_time.h
  Primitive to get the local time.
roadmap_spawn.h
  Hides the OS process control.
roadmap_library.h
  Load and link to dynamic libraries (future).

Implementations of the user interface for the GTK, GTK2 and Qt toolkits are provided, as well as one implementation of the OS interface for UNIX.

Porting RoadMap to a new environment probably means to adapt the RoadMap make files and write new implementations for the functions defined in the header files listed above.

## 11.2 PROJECTION

The maps used by RoadMap define all points using longitude/latitude coordinates (WGS 84 datum). This means the coordinates describe the position of the point on a reference elipsoid (as close to the Earth's potato-like shape as scientifically possible). On the other side the Computer (or PDA) screen is still a plane. Converting a longitude and latitude coordinate into a plane X/Y coordinate is traditionally called a "projection". There are several standard projection methods. RoadMap uses none of them that I know of.

RoadMap first approximates the WGS 84 elipsoid to a sphere. Then it considers the point at the center of the screen and compute the scale at that point (i.e. delta(x)/longitude and delta(y)/latitude. After that the local area is approximated to the plane that is tangent to the sphere on that center point. Therefore a new projection is defined each time a new screen is drawn. Also the distorsion is probably very significant when zooming out. It is possible to zoom out to the point of seeing the full continental US on the screen, and it is still recognizable. This way of doing things seems to perturbate many people familiar with map projections..

The RoadMap projection has one major advantage: after the scale has been computed (once per screen refresh), the only transformation left is a simple and fast "(center - position) * scale" conversion. There are two scales: one for longitude and one for latitude (the longitude's scale depends on the latitude). Most operations are performed using integer operations, including the pre-computed sine and cosine tables, so that RoadMap has decent performance on integer-only processors (such as most of the ARM CPUs). In order to do so the (precomputed) sine and cosine table has values that have been multiplied by 32768 and the final scale is being divided by 32768.

This projection was chosen because of its speed, not really for its accuracy. As the Earth is not exactly a sphere, and certainly far from a plane, the RoadMap projection is going to cause a measurable distorsion. This is not a significant issue in RoadMap for several reasons:

- most users are concerned with very small areas (a few street blocks), and the map distorsion is not going to be noticeable at this scale.
- the schematic representation of the streets and geographical features is more important than a geometrically correct drawing.
- the GPS position is also provided using WGS 84 coordinates and the same projection algorythm is used to represent the GPS position on the screen. The same distorsion effect applies to the GPS position, and thus the GPS position is correct relative to the street (at least when not considering map accuracy problems..).

# 12 WRITING A ROADMAP DRIVER

## 12.1 OVERVIEW

A RoadMap driver is a standard UNIX program that interacts with RoadMap using the standard input and output. There is no need to link to a specific RoadMap library, even while this is not forbidden either.

RoadMap launches each driver with its standard I/O redirected to pipes. The driver program must exit when any of these pipes breaks.

The protocol between RoadMap and the drivers uses the NMEA syntax, with one NMEA standard sentence and some RoadMap-specific extensions. The general design is that the driver takes the initative and RoadMap answers.

It is possible to write a driver that can be launched multiple times by RoadMap. The only requirement is to associate a different driver name to each occurrence in the drivers file. It is recommended the driver takes its name from its command line, using the following syntax:

           --driver=<name>

It is also recommended that the driver name be used as the preferences category when requesting a driver's specific preferences items. The makes it possible to configure each occurrence of the driver independently.

See roadmap_ghost.c for an example of a minimal RoadMap driver.

## 12.2 DRIVER COMMANDS

           $PXRMCFG,<category>,<name>,<default>

This sentence requests the value of the provided RoadMap preferences item. If the item is ot defined, RoadMap will answer with the default value provided. The RoadMap's answer uses the exact same syntax, where the default value is replaced with the actual value.

There is no need to declare a preferences item in advance: RoadMap will declare the item on the fly.

           $PXRMSUB,<item>,...

This sentence requests RoadMap to send periodic updates of the specified items. Each command adds to the subscription list: there is no way to unsubscribe. The subscription items supported by RoadMap are:

- RMC: requests RoadMap to transmit every change to its current GPS position. The RoadMap position is sent as a NMEA $GPRMC sentence.

             $PXRMADD,<id>,<name>,<sprite>

This sentence requests RoadMap to record a new object to its tracking list. The object is identified by it's ID. The name and the sprite are used for display. The sprite must have been defined in RoadMap's sprites file.

A newly created object has no position. This object will not appear on the screen until a position has been provided.

           $PXRMMOV,<id>,<latitude>,<N|S>,<longitude>,E|W,<speed>,<steering>

This sentence associates a new position to the specified object. There is no limit on how many times the position of an object can be changed. The syntax for the position mimics the syntax used in GPRMC, except that the speed and steering must be integers (no fractional part).

           $PXRMDEL,<id>

This command requests RoadMap to delete the specified object.

## 12.3 ROADMAP RESPONSES

           $PXRMCFG,<category>,<name>,<value>

This sentence is the answer to the driver's $PXRMCFG requests. The only difference compare to the request is that the default value has been replaced with the actual value.

           $GPRMC,<time>,<latitude>,<N|S>,<longitude>,E|W,<speed>,<steering>,
                  <UTC date>,0,E

This sentence is the answer to the driver's subscription to the RMC item. It uses the standard NMEA syntax, except that the speed and steering are integers (no fractional part), while the magnetic variation is always 0.

# 13 MAP FORMAT

The maps are made of three types of files: the map files themselves contains the map data, the map indexes allow for fast retrieval of the map files to display and the class files describe the features stored in each map file.

## 13.1 MAP FILES AND INDEXES

As indicated in several other places, the RoadMap map files (extension .rdm) are organized by administrative territories, such s a county per file in the US. The map files are retrieved using index files, which files themselves use a format similar to the map files. The index files contain only the list of map files, plus some indexes to accelerate the display of a specific area, or the search of an address.

As for now, the names of the US county files follow the convention below:

       usc<fips>.rdm

where "fips" is the federal identification number for that county, made of five digits: the first two digits identify the state and the last three digits identify the county within the state.

As for now, there is a single index file, named usdir.rdm. This file must be in the same directory as the map files.

This naming convention is likely to change in the near future!

The rdm files are binary files and uses the local conventions for byte order and C structure layout. In order to make it possible to share map files between different systems, an ASCII format is also defined, with the suffix .rdx; the rdmxchange program translates from one format to the other. Note that the data stored in the rdx files is strictly equivalent to the one stored in the rdm files, and the organization of this data is very specific to the RoadMap application. The rdx format was not designed to exchange data with other applications.

These two types of files, the map and index files, contain very different data but share the same general organization: these files contain multiple data tables organized in a tree fashion.

## 13.2 CLASS FILES

A class file is a text file that describes the features of a set of map files, where the features are organized in layers. Each map file contains features that belong to one (and only one) class.

An example of class would be roads. Roads would be organized in layers like freeways, highways, streets and trails. All map files describing roads will contain features organized using these same layers.

The class files are stored in the RoadMap configuration directories, thus they can be customized by the user, independently from the map files. It must be noted, however, that the way the layers are organized must not be changed. Changing the list of layers would render the existing map files more or less useless.

The preferred method for customizing a class is to create a new RoadMap skin directory, copy all the class files from an existing skin directory and then edit the class files in that new skin directory. The active RoadMap skin can be selected in the user preferences.

The class files use the same format as the preference file. It defines the properties of the various layers that make a set of maps.

The two differences with the preferences files are that there is no predefined layers in RoadMap (layers are entirely defined by the class files) and there is no default value.

A class file contains general attributes and layer attributes.

The general attributes are:

Class.Name:
  the name of the class (the name of the file does not count).

  Format: string

Class.Lines:
  the line layers, ordered with the top layer first.

  Format: a space separated list of layer names.

Class.Polygons:
  the polygon layers, ordered with the top layer first.

  Format: a space separated list of layer names.

Navigation.Car:
  the list of layers to be used for car navigation.

  Format: a space separated list of layer names.

  Comment: The layers should all be line layers.

For each layer, RoadMap use the following items:

layer.Class:
  the class of object this layer belongs to.

  Format: Road, Feature or Area.

  Comment: Road and Feature categories are searched in the "line" table of the map files and drawn as lines. The Road layer is searched when a street name is looked for. The Area objects are drawn separatly, as polygons.

layer.Color:
  the first color used when drawing the objects.

  Format: color

layer.Color1:
  the second color used when drawing the objects.

  Format: color

  Comment: This color is optional. See layer.Delta1.

layer.Color2:
  the third color used when drawing the objects.

  Format: color

  Comment: This color is optional. See layer.Delta2.

layer.Color3:
  the fourth color used when drawing the objects.

  Format: color

  Comment: This color is optional. See layer.Delta3.

layer.Thickness:
  the thickness used to draw the first color lines.

  Format: number of pixels

layer.Delta1:
  the thickness used to draw the second color lines.

  Format: number of pixels, relative to previous color if negative.

layer.Delta2:
  the thickness used to draw the third color lines.

  Format: number of pixels, relative to previous color if negative.

layer.Delta3:
  the thickness used to draw the fourth color lines.

  Format: number of pixels, relative to previous color if negative.

layer.Declutter:
  the zoom level from which the objects are hidden

  Format: integer

  Comment: The definition of this item is rather obscure. To be fixed.

The Color1 to Color3 and Delta1 to Delta3 attributes are optional, but the 1 .. n-1 attributes must be defined if the nth attribute is defined.

These additional colors are typicall used to draw streets.

## 13.3 TABLES

Each table is identified by its path name (such as "string.data.data"). RoadMap tables are organized into two levels, except for the string storage tables that are organized into three levels.

The dumpmap tool provides a view of the tree of tables.

Each table is an array of C structures. As the map files are being mapped in memory, RoadMap will access these C structure as if it was a regular C array created by the program.

Each top level section is managed by a specific RoadMap module (usually one source file) that retrieves all tables within the given top level by name. If one table is missing, RoadMap will exit with a fatal error but it is legal to have additional tables: these will simply be ignored.

Thus it is not required to know the exact details of the map format in order to be able to access the map information: each module hides the specifics of the section it handles. It is however be necessary to understand the logic organization of the map data in order to be able to navigate through it.

Each top level section is also created by a specific buildmap module (usually a single source file as well). These modules are totally independent from the format of the original data and should be usable for creating RoadMap map files from other data sources.

Thus there is no need to know the inner details of the RoadMap map format in order to generate a map file: the buildmap_* modules handle the implementation details for each section, including sorting and indexing.

All sections are described using the same descriptor structure (see roadmap_db.h) and are organized in a "Russian doll" fashion, i.e. the data area described in a given section covers all subsections (descriptor plus data area). The toplevel section are actually subsections of an anonymous root section, which descriptor starts at offset 0.

## 13.4 THE STRING SECTION

All files contain a "string" top level section. This section stores all texts associated with other records. Its purpose is to handle variable length text in the most compact way, i.e. using no more than the storage needed for the C string (string length plus terminator) and avoiding repeating identical texts. When the string tables is built all identical texts should be identified and each text stored only once.

In addition, the string section provides a search tree organized in an alphabetical fashion. This tree makes it possible to implement fast name search and completion and was also designed to allow for a "smart" keyboard that grays out invalid characters (the "smart" keyboard was never implemented since RoadMap now uses the standard system keyboard).

The string section is organized in string categories (city names, street names, etc..). All categories are organized with the same tables:

tree
  this table contains the branches of the search treeindex.
node
  this table contains the leaves of the search tree.
index
  this table contains a relative index to the actual storage location of the string. Its purpose is to allow the use of a 16 bit identifier instead of using a 32 bit offset.
data
  This table is really a byte buffer that contains the actual strings.

  The string section is handled in RoadMap by the roadmap_dictionary.c module and created by the buildmap_dictionary.c module (see matching header files roadmap_dictionary.h and buildmap.h for more information about the API).

## 13.5 DIRECTORY TABLES

The usdir.rdm file is made of the "string" and "county" sections. The "county" section provides a spatial and city search index for selecting maps involved in an address search or for visualization.

When an address is provided, RoadMap scans through the "county.bystate" and "county.city" tables to retrieve which counties might include a city by the given name. In order to separate homonymous cities in different states and accelerate the search, the cities are sorted by state and the table "county.bystate" points to the sub-table that covers each state. Thus the logic is to identify the state (sequential search) and then scan through the state's city sub-table to retrieve the city name. Remember that the city names are really stored in "string.city": "county.city" only contains the index to the city name (a 16 bit value). This also speeds up the search.

When a position (longitude, latitude) is provided, RoadMap scans through the "county.bystate" abd "county.data" tables. Once again, "county.data" is sorted by state and "county.bystate" indicates the matching sub-table. Both states and counties are located by there "bounding box", i.e. the area defined by the most southern and northern points and the most eastern and western points.

Thus RoadMap searches for all states that may cover the given location, then through the associated "county.data" sub-table to search for the counties that may covert the given location.

In most cases a position is actually itself the area visible on the screen rather than a single point. That however does not change the logic in any fundamental way: the only difference is that "coverage" is defined as a non-empty intersection between the two areas (visible v.s. bounding box).

## 13.6 MAP TABLES

The county map files are organized into the following sections:

string
  See prior description in this document. This section is defined in the roadmap_db_dictionary.h header, handled by the roadmap_dictionary.c module and created by the buildmap_dictionary.c module.
square
  Each county is subdivided using an evenly defined grid. Each element of the grid (square) is a rectangle in the longitude / latitude coordinate system. This section is defined in the roadmap_db_square.h header, handled by the roadmap_square.c module and created by the buildmap_square.c module.
point
  A spatially sorted list of position points used to define lines and polygonal areas. This section is defined in the roadmap_db_point.h header, handled by the roadmap_point.c module and created by the buildmap_point.c module.
line
  The description of lines (mostly street block). A line is defined by two points and a type (intertate, street, shoreline, etc..) This section is defined in the roadmap_db_line.h header, handled by the roadmap_line.c module and created by the buildmap_line.c module.
shape
  Additional points that define the shape of lines. Not all lines have a shape: straight lines don't. This section is defined in the roadmap_db_shape.h header, handled by the roadmap_shape.c module and created by the buildmap_shape.c module.
polygon
  The description of areas (parks, hospitals, airports, malls, etc..). A polygon is defined as a list of points. This section is defined by the roadmap_db_polygon.h header, handled by the roadmap_polygon.c module and created by the buildmap_polygon.c module.
street
  Full streets, i.e. a collection of lines sharing the same street name in the same city (and same ZIP code). This section is defined in the roadmap_db_street.h header, handled by the roadmap_street.c module and created by the buildmap_street.c module.
range
  A set of index tables to speed up the search of a street address. This section is defined in the roadmap_db_range.h header, handled by the roadmap_street.c module (not a typo !) and created by the buildmap_range.c module.

## 13.7 THE SQUARE SECTION

Each county is divided in tiles (called quite improperly "squares"). Most data (point, lines and polygons) are sorted by square and indexes allow to access only the sub-table related to one square. The purpose of the square design is to speed up drawing and research (scan smaller amount of data), avoid page fault, limit the process memory use to the local vicinity information as well as reduce the size of the maps by using 16 bit relative positions instead of 32 bit absolute ones.

The squares are generated by buildmap so that each square is small enough for a 16 bit longitude and latitude offset. All squares have the same "size" as expressed in longitude / latitude.

In some case (Hawaii) the land is a very sparse subset of the grid, so the grid is described using a list of grids instead of a complete matrix. RoadMap regenerate the matrix when the file is mapped. Without that optimization Hawaii could not be handled.

The square section is made of two tables: square.global and square.data.

The global table contains only one record that stores the size of the matrix (in number of element) and the size of each element (as longitude and latitude offsets).

The data table contains the position of each square as well as the number of points located in that square.

## 13.8 THE POINT SECTION

All points referenced by the lines and polygons are actually stored in this section. The shape are however different (not made of points, see later).

The point section is made of two tables: point.data and point.bysquare.

The data table contains the position of each point, relative to the south-west corner of its square. Which means you cannot know where a point is without knowing in which square it is.

The bysquare table is an index to retrieve all points within a given square. The index in point.bysquare is the square index. All the points sorted so that all points within a given square are grouped. This format optimizes the search by square, which is the most used one (such as when drawing a map).

## 13.9 THE LINE SECTION

A line represents a street block, a section of freeway, a ramp, a section of shore, etc.. These lines are all listed in the same table and indexes allow for a fast access according to the location and type. A line is represented with two points: a "from" point and a "to" point. The choice of which point is the "from" is derived fro the corresponding line definition in the map's original source format (usually the first point listed is the "from" point).

The line section is made of the following tables: line.data, line.bysquare, line.bysquare2 and line.index2.

The data table contains the reference to the two end points of the line. Note that the shape is stored separately. Lines are sorted by square and type.

The bysquare table references the sub-table that represents all the lines in the given square. Each record actually contains as many references as there are possible line type: it references each sub-table that represents the lines of a given type in the square. This speeds up drawing as all the lines of a given type are in the same layer, using the same video attributes (color, thickness, etc..) and are displayed at the same time.

The bysquare2 and index2 tables are used to identify these lines that cross square limits, i.e. the lines that have their two endpoints in two different squares. Table bysquare2 is identical to bysquare, except it references table index2 instead of table data. The table index2 contains the index to the data table. This indirection is needed because the lines have been sorted according to their "from" endpoint, not by their "to" endpoint.

## 13.10 THE SHAPE SECTION

A shape contains the middle points needed to represent curved lines. These middle points are not regular points because they connect nothing together and do not participate into the map's logical organization: the shapes are only useful to display a more accurate drawing of the associate line. It has no function beyond just look.

The middle points are represented using 16 bit relative offsets from each others, starting with the line's "from" endpoint. If two middle points are too far from each other the buildmap_shape.c module will automatically create additional middle points, as many as required to comply with the 16 bit offset limitation.

The shape section is made of the tables shape.bysquare, shape.byline and shape.data.

The table data contains the list of middle points, sorted by square, line and order in the line. Thus all middle points required to represent a given line are grouped together and all lines within a given square are also grouped together.

The table byline identifies the line (index into the line section, see above) and the list of middle points.

The table bysquare points to the sub-table of byline that contains all the lines within the given square.

## 13.11 THE POLYGON SECTION

The polygon section describes features such as malls, airports, parks, lakes, etc..

A polygon is represented by a list of lines that defines the area of the polygon (buildmap checks that the list of lines represents a valid and complete border).

The polygon section contains the tables polygon.head and polygon.points.

The points table lists the points that make the border of the area, grouped by polygon and sorted so to form a valid polyline fit for drawing the polygon. This table references points defined in the point section. The main reason d'etre for this table is the grouping and sorting: the points are not sorted using the same criteria as in the point section.

The head table describe the polygon's bounding box, type, name, etc.. It also point to the first and last point that defines its border.

Note that polygons are not sorted by square, as there is no limit on how many squares a polygon could belong to. A use of a more traditional spatial index could have been useful here.. Note however that the number of polygons in a given county is relatively limited, so a more effective visibility search is not critical to RoadMap performances.

## 13.12 THE STREET SECTION

This section contains the tables street.name and street.type.

The table name contains the references to all the elements of a street name: prefix (South, North, etc..), name, type (Road, Street, Lane, etc..) and suffix (South, North, etc..).

The table type contains one-byte elements that indicates the type of line for that street (see the line section). This table is not used.

The main reason d'etre for the street section is to gather togethers elements that are repeatitively referenced together in the range section.

## 13.13 THE RANGE SECTION

The range section describe the street addresses. This is the section the "find by address" feature of roadmap is based on. It also contains the name of those lines for which there is no address associated.

The range section is made of the following tables:

range.bystreet
  for each street, the ranges that belong to the street. [range.bycity] the list of ranges by street, brocken for each city. [range.addr] for each range, the street address numbers. [range.noaddr] reference to the street for the lines with no address. [range.byzip] for each range, the ZIP code. [range.place] for each place, the city it belongs to. [range.bysquare] for each square, a street search accelerator.

## 13.14 THE EXCHANGE FORMAT

The rdx files are straight conversion of the rdm file in an ASCII format that is neither sensitive to the CPU byte order or the compiler's structure layout. Apart from that ASCII representation, the list of tables and the content of each table is exactly the same as for the rdm file. The purpose of the rdx format is to allow the public distribution of map files that can be used on all CPU architectures.

A rdx file is organized in two major sections: the first section contains one header per table; the second section contains the data for each table.

A table header is one text line, with two comma-separated fields: the table name and the table size (in number of records). The header section ends with an empty line.

The data section is a sequence of table data, each table is separated from the previous table with an empty line.

Each table data contains the following lines, in that order:

Table name
  [Fields] [Record] [...] [Record]

  The table name is the full path of the table, such as "range/bysquare".

  The fields line is a comma separated list of fields. A field may be suffixed with an array size indication. For example:

            excluded[32],included[32],start,count

  Each record line is a comma separated list of values, in the same order as specified in the fields line. The values of an array field are stored sequentially, as if these were different fields. Value 0 may be represented using an empty string. For example:

            5,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,10,22