PathAway version 3
Advanced Mapping Manual
Last Updated: July 2, 2003
Table of Contents
Getting Started
Coming Soon.
Tutorial
Coming Soon
Terminology
Map Datums Descriptions (coming soon)
Reference
Calibrate Maps
Coming Soon
Map ProjectionsMap projections are attempts to portray the surface of the earth or a portion of the earth on a flat surface. Some distortions of conformality, distance, direction, scale, and area always result from this process. Some projections minimize distortions in some of these properties at the expense of maximizing errors in others. Some projection are attempts to only moderately distort all of these properties. See Map Projection Descriptions for more definitions of supported projections and parameters of use. Supported ProjectionsAbout Projections PathAway 3.0 supports Map projections through the ProjLib shared library. This library is based on the publicly available projection library PROJ4. The projection parameters required in Proj4 apply to PathAway3 and must be included in the Calibration command for Projection. Note Touratech-QV does this automatically when you convert a projected map to PathAway. PathAway supports only projections with Forward and Inverse projection capabilities. (more to come)
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Map DatumsSupported Datum Grids
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Supported Ellipisoids
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Map Conversion Tools
PathAway Map Manager
Use the Map Manager to prepare maps for PathAway. The application is quite simple and straight forward. To prepare a map follow these steps:
1. Ensure the map is in either Jpeg or BMP format.
2. Run the PathAway Map Manager.
3. To import a map, choose from the menu Map-Import Map. Select your map from the dialog.
4. Next, give the map a name, and set its color depth. The color depth must at least match your device's. Most Handheld devices support color depths that are equal to or less than the maximum available on the device. I.e. if your device supports up to 256 colors, then, 4-bit gray-scale maps will work.
5. The next step is to Calibrate your map's geographic coordinates so it can be used for GPS Navigation. To set the calibration for the map, click on the Calibrate button on the top panel of the Map Window. The Calibration panel will appear.
NOTE: if you're not sure of the map's coordinates, you can calibrate the map later in PathAway based on captured GPS points. (See the PathAway manual section on Calibrating Maps ).
Calibrating Maps in PathAway Map Manager
The simplest form of calibration is a map defined by Top-Left and Bottom-Right coordinates. You can enter the longitude and latitude coordinates of each corner of the map. You can also calibrate a map by its known Projection parameters. The 3x3 calibration option is used by Touratech-QV to perpare maps for PathAway.
Calibrate by Top-Left and Bottom-Right Points
First choose the "Calibrate
The position coordinates can be specified by one of the following methods:
1) By top-left and bottom right or,
2) By the map center coordinates, and the total distance covered by the map. Total distance is in statute miles. To convert from nautical miles to statute miles, multiply nautical miles by 1.151. For Kilometers to Miles, multiply kilometers by 0.621
3) By the known longitude and latitude coordinates of known points on the map. With this method, you can set up to 9 points on the map to calibrate on. For each point, you can click on it's position on the map and enter it's geographic coordinates. Once you have entered all of the points, click Apply, and the top-left and bottom-right corrds of the map will be calculated.
When you're done setting up the map, save the map by selecting File-Save Map As. You will be prompted to save it with a .prc extension. You can also send the map directly to your Handheld using the File-Send To command.
QuoVadis/TOURATECH QV
QuoVadis is a powerful PC-Desktop GPS solution that now integrates support for creating, viewing, and editting PathAway Maps, Routes, Tracks, and Points. QuoVadis also sells maps for locations all over the world.
The combination of QuoVadis and PathAway provides you with a complete navigation solution. Acquire and prepare all your maps, create your routes, and edit your points, in QuoVadis. Then, transfer the data to PathAway to take with you on the road. Once you return from your trip, import all your the new recorded tracks, and points back into QuoVadis for easy viewing, and editting.
See http://www.quovadis-gps.com for more information.
PathAway Map Conversion SDK
PathAway Data Conversion tools allow advanced users and developers to convert maps to PathAway format, and to convert routes, tracks, and waypoints to and from PathAway format. The Data conversion tools are currently in the form of Command Line batch programs, and Windows DLL format.See the PathAway Data Conversion Tools page to download the tools, and get detailed information.
Special Cases
Calibrating OSGB Maps
Most OSGB maps have horizontal and vertical OSGB Grid lines. PathAway Rectangular Calibration requires Longitude/Latitude lines to be horizontal/vertical. If this is the case for your OSGB map, you will need to either rotate the map so the Long/Lat lines are rectangular, or you will need to use a Projected map to Calibrate correctly. To calibrate OSGB maps such as this you can use the following projection parameters:
Calibration Type: Projection
Datum: OSGB
Projection: Transverse Mercator
lon_0: W2.000
lat_0: N49.00
x_0: 400000
y_0: -100000
Use at least 2 known points for the calibration points.