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As with the first version, the validation of the GDEM version 2 (GDEM2) was the joint responsibility of U.S. and Japanese partners. The Japanese validation was conducted by the Earth Remote Sensing Data Analysis Center (ERSDAC) in cooperation with the University of Tokyo and Mitsubishi Materials Techno Corporation (under contract to ERSDAC). The U.S. validation team included the U.S. Geological Survey (USGS, in cooperation with NASA), NASA’s Jet Propulsion Laboratory (JPL), the National Geospatial-Intelligence Agency (NGA) and the NASA Goddard Space Flight Center (GSFC).
A summary report (3 MB) is provided as an overview of these validation efforts. The ERSDAC report (2 MB) addresses horizontal and vertical accuracy, horizontal resolution, and artifact characterization over Japan. The USGS report (0.5 MB) focuses on absolute vertical accuracy assessments, as well as comparisons to the Shuttle Radar Topographic Mission and National Elevation Dataset one arc-second DEMs, over the Conterminous US. The NGA report compares the GDEM2 to one arc-second SRTM elevations at 20 sites globally, and characterizes artifacts. The NASA/GSFC report describes a global comparison of the GDEM2 to elevations derived from the Ice, Cloud and land Elevation Satellite (ICESat). The ICESat report (22 MB) also includes a set of results tables (0.1 MB).