Correcting Dem Extracted from Aster Stereo Images by Combining Cartographic Dem

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on-board the NASA's Terra spacecraft provides along-track digital stereo image data at 15m resolution with a base-height ratio 0.6. Automated stereocorrelation procedure was implemented using the ENVI 4.1 software to derive DEMs with 15m×15m in 43 km long and 50 km wide area using the ASTER stereo images. The cloud areas and cloud shadow areas removed on the ASTER DSM were replaced with those areas detached from the digital topographic map DEM by band math. The accuracy of DEMs was analyzed in comparison with those which were obtained from digital topographic maps of 1:25,000 scale. Results indicate that RMSE in elevation between ±7 and ±20m could be achieved. Excluding cloud, water and building areas as the factors which make RMSE value exceeding 10m, the accuracy of DEMs showed RMSE of 5.789m. *Jin-Duk Lee , School of Civil and Environmental Engineering, Kumoh National Institute of Technology, [email protected]