Publisher: National Geospatial-Intelligence Agency (NGA)

SRTM data sets result from a collaborative effort by NASA and NGA, as well as the participation of the German and Italian space agencies to generate a near-global digital elevation model of the Earth using radar interferometry. Sometimes referred to as "90 meter" data, the sample spacing of SRTM3 for individual data points is 3 arc-seconds. Version 2 of the SRTM digital topographic data (also known as the "finished" version) is the result of a substantial editing effort by the NGA and exhibits well-defined water bodies and coastlines and the absence of spikes and wells (single pixel errors), although some areas of missing data ('voids') are still present. The default file format for SRTM data is .HGT; After selecting desired tiles, customers may choose a variety of industry-standard georeferencing and formatting options. The SRTM-3 is a cost-effective choice for many applications.
East View Cartographic maintains an extensive inventory of off-the-shelf Digital Elevation Models (DEMs) for immediate delivery. In addition EVC can provide precision DEMs from various in-stock and easily accessible source materials. Such products include DEMs at 90m, 50m, 30m and higher accuracies for much of the world's surface. Source materials include global coverage topographic maps, stereo satellite imagery, and aerial photography. For information on products not listed on the web site please inquire by contacting customer service.  

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