Ground Motion Service Germany (BBD) 2015-2021 L2B Descending (WMTS)

The diverse geology of Germany and the resulting use are the causes of a wide variety of ground motions, such as soil compaction, landslides, groundwater extraction, natural gas extraction, (abandoned) mining and cavern storage operations. The products of the Ground Motion Service Germany (BBD) are based on SAR data from the Copernicus Sentinel-1 mission and Persistent Scatterer Interferometry (PSI) processing. The BBD portal contains PSI data from the entire Federal Republic of Germany (approx. 360,000 km²). PSI technology enables precise measurements of ground motions in the mm range. The measuring points (Persistent Scatterer, PS) correspond to objects already present on the ground, such as buildings, infrastructure or natural objects such as rocks. Each PS is characterized by a velocity value averaged over several years (expressed in mm/year) and a time series of displacements. For each PS, the time series of displacements from the first Sentinel-1 acquisition to the last evaluated Sentinel-1 acquisition can be viewed. The PS are visualized according to the mean velocity along the line of sight (LOS) of the Sentinel-1 satellites according to the following convention in the BBD portal: - the green color corresponds to the PS, whose average speed is very low, between -2.0 and +2.0 mm/year, i.e. in the sensitivity range of the PSI technology; - those PS with a negative movement rate are visualized in the colors from yellow to red, i.e. movements away from the satellite; - the colors from turquoise to blue visualize those PS with a positive movement rate, i.e. PS that are approaching the satellite. The precision of the PSI data presented is on the order of typically +- 2 mm/year for the average velocity in LOS.