UTM-WGS84 cartographic coordinates, while the orthometric heights were determined by using the corresponding ellipsoidal Earth Gravitational Model (EGM 96) geoid [ASTER Validation Team, 2011]. ASTER GDEM is made to order following the selection of tiles through the Earth Observing System (EOS) Data Gateway. The overall vertical accuracy of ASTER elevations is specified to vary between 8.68 m and 18.31 m [ASTER Validation Team, 2011]. Generally error increases as the topography become rougher. This ASTER product is available at no charge for any user pursuant to an agreement between METI and NASA.