The ASTER global DEM V2 is available at no charge to users from the Earth Remote Sensing Data Analysis Center (ERSDAC) of Japan and from LP DAAC.
Nasca lines, seen by ASTER

In 2009 NASA and the Japanese Ministry of Economy, Trade, and Industry (METI) released the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) global digital elevation model (DEM), which covers about 99% of the Earth’s surface. The global DEM was built from 1.5 million individual scene-based ASTER DEMs. The global DEM is in GeoTIFF format with lat/long coordinates and a 1 arc-second (30 m) grid. It is referenced to the WGS84/EGM96 geoid. Accuracy is estimated to be 20 meters for elevations and 30 meters for horizontal data.

ASTER is an imaging instrument flying on Terra, a satellite launched in December 1999 as part of NASA’s Earth Observing System (EOS). ASTER is a cooperative effort between NASA, Japan’s Ministry of Economy, Trade and Industry (METI) and Japan’s Earth Remote Sensing Data Analysis Center (ERSDAC).

Based on measurements from NASA’s Terra spacecraft, a new 3D topographic map has been released, again as a joint effort by NASA and Japan. An additional 260,000 additional stereo-pair images were added to enhance the latest version of the DEM.

The ASTER global DEM V2 is available at no charge to users from the Earth Remote Sensing Data Analysis Center (ERSDAC) of Japan and from LP DAAC. Examples of quality improvements in Version 2 are found here.

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About fjbehr

Prof. Dr.-Ing. Franz-Josef Behr, Professor of Geoinformatics at Stuttgart University of Applied Sciences (http://www.gis-management.de/). His specializations include * Internet, Internet GIS * XML, GML, SVG * Data exchange and Interoperability * Visualization * Open Source Solutions * Consulting Member of the DIN working group NA 005-03-03 AA "Arbeitsausschuss Kartographie und Geoinformation" (Sp CEN/TC 287+ISO/TC 211). He is the author of two authoritative books on GIS in German, one is "Strategisches GIS-Management", published by Wichmann Verlag (2004). The second is "Einführung in Geographische Informationssysteme" (1997).

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