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The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000. As of 2016, it is now almost universally available at 1-Arc Second resolution.

The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000.

Source: Jet Propulsion Laboratory.

Link to Wikipedia article.

http://www.digital-geography.com/announcement-realease-worldwide-high-resultion-srtm-data-30m/

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