Comparison in terms of accuracy of DEMs extracted from SRTM/X-SAR data and SRTM/C-SAR data: A Case Study of the Thi-Qar Governorate /AL-Shtra City

Abstract

It is important to investigate the accuracy of Digital Elevation Models (DEMs) because of their high impact on all engineering and scientific disciplines Photogrammetry, traditional surveying, remote sensing systems and satellite whole DEMs output methods. In this paper include the DEM data produced by the shuttle radar topography mission (SRTM) data, Where tested and evaluation DEM data for an area of 100 square kilometers in Iraq /Thi-Qar Governorate - Al-Shtra city. The result of root mean square error (RMSE) is 0.902 m for the digital elevation models (DEM) derived from the SRTM/C-SAR data (SRTM-DEM (V4.1)) and (RMSE) is 3.141 m for the digital elevation models (DEM) derived from the SRTM/X-SAR data (DTED (L2)). So clearly, the DEM product from the SRTM/C-SAR data a more accurate representation of the topography of the ground.