Data sources

From gpsdrive

Contents 1 Data sources 1.1 Worldwide / Generic 1.1.1 Online MapServers 1.1.2 GIS data 1.1.2.1 Using GDAL and OGR 1.1.3 Navigation data 1.1.4 Other WMS servers 1.1.5 NASA's Blue Marble 1.2 Canada 1.2.1 Terrestrial data 1.2.2 Nautical data 1.3 United States 1.3.1 Terrestrial data 1.3.2 Nautical data

Data sources

Worldwide / Generic

Online MapServers

• OpenStreeMap.org

• gpsfetchmap.pl:
  • Google Maps
  • source2...
  • source3...
  • source4...

GIS data

• Collection of Global GIS dataset links

Using GDAL and OGR

• GDAL homepage
• gdal_slice.sh - script to chop up a georeferenced raster image in any supported GDAL format to GpsDrive tiles

• OGR vector data will need to be processed through GRASS
  • supported OGR vector formats

Navigation data

• Generic S-57 ENC format

Other WMS servers

• idea: build generic WMS support into gpsfetchmap.pl by hacking current code or using GDAL 1.5.0's WMS import tool.

Advantage: you can specify target tile size (1280x1024) directly in the request; simpler with fewer steps (ie doesn't require any heavy lifting with GRASS).

• Use GRASS's r.in.wms module to load into GRASS, then run d.out.gpsdrive

NASA's Blue Marble

• NASA Blue Marble TNG BitTorrent info from GeoTorrent.org.

The built-in GpsDrive Blue Marble support uses the older Blue Marble 2002 dataset, not these ones.

Canada

Terrestrial data

• Scanned raster maps from Natural Resources Canada: http://www.geogratis.gc.ca/geogratis/en/download/scanned.html

(if possible, try to find Tiff format, hopefully they will be GeoTiffs)

• Pat found good, free topo maps and nav charts (boat maps) for Canada.

Browse to find the data block from: http://toporama.cits.rncan.gc.ca/toporama_en.html

and then download the GeoTIFF for that block from: http://ftp2.cits.rncan.gc.ca/pub/canmatrix/50k_300dpi/031/e/

That may be in lat/lon with the NAD83 datum. For correctness's sake you could convert that to WGS84 first using gdalwarp. (GPSs typically provide fixes in WGS84) But as the difference between NAD83 and WGS84 are so minor (NAD83 uses the GRS80 ellipsoid) the error is likely to be much less than the distance covered by the pixel width, so not worth the trouble. (?)

Finally, create GpsDrive tiles with the gdal_slice.sh script.

Nautical data

• ...

United States

Terrestrial data

• Libremap has
  • 24k scale USGS DRG's - detailed topographic maps for all 50 states.
  • SVG boundary border files for all US states (including state, county, and town boundaries)

• OpenStreetMap.org has imported all US roads into their database from the US's TIGER dataset.

Nautical data

NOAA ENC and BSB Navigational Charts

See these mailing list posts for more detail:

http://thread.gmane.org/gmane.comp.linux.gps/3920/focus=3937

http://thread.gmane.org/gmane.comp.linux.gps/3920/focus=3934

• NOAA S-57 format vector data (ENC)

http://nauticalcharts.noaa.gov/mcd/enc/

• NOAA BSB format raster data (RNC)

http://nauticalcharts.noaa.gov/mcd/Raster/

• Nice previews / chart picker:

http://www.oceangrafix.com/o.g/search-nautical-charts.html