  Geodetic stereo Synthetic Aperture Radar (SAR) is capable of absolute
three-dimensional localization of natural Persistent Scatterer (PS)s which
allows for Ground Control Point (GCP) generation using only SAR data. The
prerequisite for the method to achieve high precision results is the correct
detection of common scatterers in SAR images acquired from different viewing
geometries. In this contribution, we describe three strategies for automatic
detection of identical targets in SAR images of urban areas taken from
different orbit tracks. Moreover, a complete work-flow for automatic generation
of large number of GCPs using SAR data is presented and its applicability is
shown by exploiting TerraSAR-X (TS-X) high resolution spotlight images over the
city of Oulu, Finland and a test site in Berlin, Germany.
