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The freely available ASTER GDEM ver2 was released by NASA and METI on October 17, 2011. As one of the most complete highresolution digital topographic data sets of the world to date, the ASTER GDEM covers land surfaces between 83<sup>°</sup>N and 83<sup>°</sup>S at aspatial resolution of 1 arc-second and will be a useful product for many applications, such as relief analysis, hydrological studies andradar interferometry. The stated improvements in the second version of ASTER GDEM benefit from finer horizontal resolution,offset adjustment and water body detection in addition to new observed ASTER scenes. This study investigates the absolute verticalaccuracy of the ASTER GDEM ver2 at five study sites in China using ground control points (GCPs) from high accuracy GPSbenchmarks, and also using a DEM-to-DEM comparison with the Consultative Group for International Agriculture ResearchConsortium for Spatial Information (CGIAR-CSI) SRTM DEM (Version 4.1). And then, the results are separated into GlobCoverland cover classes to derive the spatial pattern of error. It is demonstrated that the RMSE (19m) and mean (-13m) values of ASTERGDEM ver2 against GPS-GCPs in the five study areas is lower than its first version ASTER GDEM ver1 (26m and -21m) as a resultof the adjustment of the elevation offsets in the new version. It should be noted that the five study areas in this study arerepresentative in terms of terrain types and land covers in China, and even for most of mid-latitude zones. It is believed that theASTER GDEM offers a major alternative in accessibility to high quality elevation data

EVALUATION OF ASTER GDEM VER2 USING GPS MEASUREMENTS AND SRTM VER4.1 IN CHINA