USGS offers digital elevation maps as rasters [1]. There is also the 10-meter SRTM data from shuttle SAR [2]. Combining elevation with the USGS topo maps visu

USGS offers digital elevation maps as rasters [1]. There is also the 10-meter SRTM data from shuttle SAR [2]. Combining elevation with the USGS topo maps visually for 3D is an interesting image processing task. What hardware are you using in your tracker? [1] http://nationalmap.gov/elevation.html http://nationalmap.gov/elevation.html [2] https://en.wikipedia.org/wiki/Shuttle_Radar_Topography_Mission https://en.wikipedia.org/wiki/Shuttle_Radar_Topography_Missi...