Reference:Farr et al. 2007
From Global Warming Art
"The Shuttle Radar Topography Mission produced the most complete, highest resolution digital elevation model of the Earth. The project was a joint endeavor of NASA, the National Geospatial-Intelligence Agency, and the German and Italian Space Agencies, and flew in February 2000. It used dual radar antennas to acquire interferometric radar data, processed to digital topographic data at 1 arc-sec resolution. Details of the development, flight operations, data processing, and products are provided for users of this revolutionary data set."
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