Optimization of the tie-pointing procedure for the terrain correction of SAR data

Usually tie-points are manually derived from map sheets. This time consuming process requires a significant part of the overall terrain correction process. Additionally it hampers the automation of the SAR-orthorectification. Therefore an autocorrelation method was implemented for DFD´s operational SAR geocoding system GEOS. It considers tie-point chips as reference. Further improvements can be achieved by considering a bundle block adjustment. The advantages are the reduction of tie-points required per scene and the ability to span areas without any reference for geolocation information. GEOS is currently supplemented by such a technique