October 17, 2011
Best-ever topographic map of Earth released
Was created from images by Japanese instrument aboard NASA satellite
At 14,505 feet in elevation, California's Mt. Whitney, located in the
Sierra Nevada Mountains on the west side of Owens Valley, is the highest
point in the contiguous United States.
The most complete digital topographic ever made of the Earth was released by NASA Monday.
The map, known as a global digital elevation model, was created from images collected by the Japanese Advanced Spaceborne Thermal Emission and Reflection Radiometer, or ASTER, instrument aboard NASA's Terra satellite.
The 3-D effect is achieved by merging two slightly offset two-dimensional images (called stereo-pair images) to create depth.
The first version of the map was released by NASA and Japan's Ministry of Economy, Trade and Industry (METI) in June 2009.
"The ASTER global digital elevation model was already the most complete, consistent global topographic map in the world," said Woody Turner, ASTER program scientist at NASA Headquarters in Washington, D.C. "With these enhancements, its resolution is in many respects comparable to the U.S. data from NASA's Shuttle Radar Topography Mission, while covering more of the globe."
The ASTER data cover 99 percent of Earth's landmass and span from 83 degrees north latitude to 83 degrees south.
The improved version of the map adds 260,000 additional stereo-pair images to improve coverage. It features improved spatial resolution, increased horizontal and vertical accuracy, more realistic coverage over water bodies and the ability to identify lakes as small as 0.6 miles in diameter. The map is available online to users everywhere at no cost at https://lpdaac.usgs.gov/ or http://www.ersdac.or.jp/GDEM/E/4.html .
"These data can be used for a broad range of applications, from planning highways and protecting lands with cultural or environmental significance, to searching for natural resources," said Mike Abrams, ASTER science team leader at NASA's Jet Propulsion Laboratory in Pasadena, Calif.
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