Free Elevation Data: 30-meter ASTER

Another source of free elevation data is the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) mission,  which was sponsored by NASA and Japan’s Ministry of Economy Trade and Industry (METI) and launched in December of 1999. Like the SRTM mission, elevation data were gathered in 1 arc-second intervals, the equivalent of approximately 30 meters (depending on…

Free Elevation Data: 90-meter SRTM

There are a number of sources of free elevation data, with varying degrees of horizontal accuracy and spatial resolution. One of the coarser datasets comes from the Shuttle Radar Topography Mission (SRTM), which gathered elevation data for 1 arc-second intervals in 2000. [An arc-second is equivalent to approximately 30 meters, depending upon the longitude. Thanks, internets!] These…