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EVALUATION OF THE GEOMETRIC ACCURACY OF TERRASAR-X

The TerraSAR-X launched on June 15, 2007 is one of the most state of the art satellite sensors. Its sophisticated feature is in demand for the application for map generation and monitoring purposes. One of the basic products of TerraSAR-X is the Enhanced Ellipsoid Corrected (EEC) orthorectified image. The product is projected to map geometry and terrain induced distortions are corrected using a digital elevation model (DEM). The geometric accuracy of this product depends on the referred DEM. In this study, we evaluated the pixel location accuracy of the product by two methods. The method using corner reflectors shows that the pixel location accuracy of SSC product was better than 1 meter, and that of EEC product was better than 5 meter in the flat area. On the contrast, the pixel location accuracy of the mountain areas evaluated by comparison with digital maps was reduced. It reveals that the enhancement of the orthorectified product is necessary for considering the creation of the topographic maps using TerraSAR-X data. * Corresponding author.