Abstract: A 15-m ASTER Digital Elevation Model (DEM) of the Grove Mountains area which is located at 72°45′S, 75°00′E was generated by optical stereo technique and an InSAR DEM with resolution of 20 m was derived. ICESat data were introduced in the process of the ASTER DEM construction, and utilized to correct the InSAR DEM. ICESat footprints were used as elevation control points during the ASTER DEM generation to reduce mismatching points. Finally, the vertical accuracy of the DEM was improved. The InSAR DEM was corrected using the quadratic polynomial with ICESat footprints as control points. And this correction has been designed to eliminate errors introduced by inaccurate estimations of the baseline. The accuracies of the ASTER and InSAR DEMs were evaluated using another set of ICESat data and the major error sources were discussed. Furthermore, the two DEMs were compared and analyzed. The specific advantages and disadvantages of these two techniques in DEM construction of the ice sheet in Antarctica were elaborated, and the advantages of both DEMs were combined to generate a high-accuracy DEM of the Grove Mountains area.

Key words: ASTER, InSAR, DEM, Grove Mountains