ACCURACY COMPARISON OF THE SRTM, ASTER, NED, NEXTMAP® USA DIGITAL TERRAIN MODEL OVER SEVERAL USA STUDY SITES

Accurate digital terrain models (DTMs) are necessary for a wide variety applications. National-scale mediumresolution elevation data have been acquired for the conterminous United States under the USGS National Elevation Data (NED; 10 m and 30 m), the Shuttle Radar Topographic Mapping (SRTM; 30 m), and the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER; 30 m) programs. Intermap’s STAR technology offers an improvement over the NED and SRTM datasets with its high-resolution (5 m) bare-ground and firstsurface elevation data and coincident orthorectified radar imagery over the conterminous United States and 17 Western European countries. SRTM, ASTER, NED and NEXTMap® elevation data over several study sites across the United States were compared to in-situ barren land elevation measurements and National Geodetic Survey (NGS) verification check points. The range of study sites represent various terrain types (slope range 0 o - 30 o

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