ASTER GDEM version 2 Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER, http:// asterweb.jpl.nasa.gov/) Global Digital Elevation Model (GDEM) version 2 was released on October 2011 by the National Aeronautics and Space Administration (NASA) and Japan’s Ministry of Economy, Trade and Industry (METI). ASTER GDEM version 2 (GDEM V2) is obtained from data collected by the sensor Visible Near Infrared (VNIR), using bands 3N (nadir-viewing) and 3B (backward-viewing) with a resolution of 15 m with a swath 60 km wide. ASTER GDEM V2 is organized according to a regular grid of 30x30 m