Value Added Geocoded ENVISAT-ASAR Product Service

Abstract

The German Remote Sensing Data Center (DFD) of the German Aerospace Center (DLR) is an element in the network of the Multimission Facilities of ESA and responsible among other tasks for SAR processing. The DLR has implemented a service for value added products over land. This service can support the user community with preceise geocoded products in addtion to the standard products of ESA. The Envisat GEOcoding system (EGEO) support the highresolution image modes, the medium resolution and the global mode from ENVISAT, product examples will be presented. The user service includes also the integration of national geodetic maping parameter to the products. Different datumshift parameter sets are implemeted. New parameter sets can be easily integrated, if the user can deliver the required geodetic parameters. Two major types of geocoded products are available:

· Enhanced Ellipsoid Corretced (EEC) · Enhanced Geocoded Terrain Corrected (ETC) The EEC generation is a fully automated process. The process has access to a Digital Elavation Model (DEM) data base, because a GLOBE DEM (1km resolution) ist used to reduce height induced errors in a global quality. The ETC uses the best available DEM to eliminate geometric mislocation. SRTM DEMs with 100m and 25m resolution and other high resolution DEMs, e.g. InSAR DEMs or from other sources can be utilized. The system was built up in co-operation with the Remote Sensing Laboratory (RSL), University Zürich (CH) and Joanneum Research, Graz (A). ESA and the German ministry of Education and Research (BMBF) supports this project.