Generation of precise wide-area geocoded elevation models with ERS SAR data

The authors present an improved technique for the generation of digital elevation models (DEM), capable of dealing with full scene images (100/spl times/100 km) coming from an interferogram obtained with ERS satellite data. Starting from an interferometric processor aimed to the geocoding of smaller areas, now the authors expound the new improvements based on the use of ground control points (GCP) in order to calibrate some imprecisions which appear in the case of very wide swaths. A generated DEM of the test zone of Tarragona (Spain) and its error assessment are presented.