Worldwide / Generic
- Google Maps
- 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
- 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
- The built-in GpsDrive Blue Marble support uses the older Blue Marble 2002 dataset, not these ones.
- 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.
- 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.
NOAA ENC and BSB Navigational Charts
- See these mailing list posts for more detail:
- NOAA S-57 format vector data (ENC)
- NOAA BSB format raster data (RNC)
- Nice previews / chart picker: