![]() Topography as contours (on 1:100,000 scale) in SDTS format (“hypsography”).This dataset was assembled from a variety of sources, including digitizing contours, analysis of aerial photography, and now airborne lidar and radar projects. Here’s Lexington, VA 7.5 minute quadrangle as a DEM. had the former National Elevation Dataset (NED) and now 3D Elevation Program (3DEP) 1 arc second (roughly 30 m) data is available for the entire US at the National Map.note the white patches (voids) where thick clouds or topographic shadows prevented transmission of the radar signal. Was the first global topographic dataset of earth (but long after Mars….)Įxample from near Mt. SRTM (Shuttle radar topography mission) (formerly 3 arc-second global data, now 1 arc-second globally).Western Half of the Salt Lake City 1 x 2 degree sheet ![]()
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