Underlying average slope data at the level of individual 30 arc-second cells on a grid across the surface of the Earth provided as a compressed ASCII grid for use in GIS software
Elevation data provides a detailed description of terrain and surface. The data are established as point clouds from airborne laser scanning or matching from aerial images. The point clouds have varyi
This Shuttle Radar Topography Mission (SRTM) DEM was created from level 1 data which was cleaned and had holes patched. The data does not incluse the Shetland Islands as SRTM data becomes unreliable a
AUSGeoid98 data files contain a 2 minute grid of AUSGeoid98 data covering the Australian region, which you can use to interpolate geoid-ellipsoid separations for the positions...
