NASA og Japans Ministry of Economy, Trade and Industry annonserte 29. juni at dei har produsert ein global terrengmodell basert på ASTER-målingar som er lagt ut i public domain. Oppløysinga er 30 m og formatet er GeoTIFF. Frå heimesidene til NASA:
ASTER Global Digital Elevation Map Announcement
Japan’s Ministry of Economy, Trade and industry (METI) and NASA announced the release of the ASTER Global Digital Elevation Model (GDEM) on June 29, 2009. The GDEM was created by stereo-correlating the 1.3 million scene ASTER VNIR archive, covering the Earth’s land surface between 83N and 83S latitudes. The GDEM is produced with 30 meter postings, and is formatted in 1 x 1 degree tiles as GeoTIFF files. Each GDEM file is accompanied by a Quality Assessment file, either giving the number of ASTER scenes used to calculate a pixel’s value, or indicating the source of external DEM data used to fill the ASTER voids.
Nils Roar 
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