A Comparison of the German and the European Ground Motion Services

Since the end of 2022, two ground motion services that cover the complete area of Germany are available as web services: the latest release of Bodenbewegungsdienst Deutschland (BBD) [1] provided September 2022 by Federal Institute for Geosciences and Natural Resources (BGR) and the first release of the European Ground Motion Service (EGMS) [2] as part of the Copernicus Land Monitoring Service. Both services are based on InSAR displacement estimations generated from Sentinel-1 data that were processed by GAF AG with software developed by Earth Observation Center (EOC), which is part of German Aerospace Center (DLR). It suggests itself to ask, if there is some added value of BBD over EGMS and how well do the two new releases perform compared to other geodetic techniques. For a study commissioned by the surveying authorities of the state of Baden-Württemberg (Landesamt für Geoinformation und Landentwicklung Baden-Württemberg (LGL)), we investigated the performance of BBD and EGMS and validated them against levelling and GNSS data.