Data produced as part of ESA Terrafirma project. The PSI processing has been carried out by DLR (). PSI processing used 77 scenes of ERS data. Number of of points = 2077373, Point density = 800 PS/km2, Reference point location is lon: 13.0, lat: 52.5. Terrafirma service providers have been validated by the ESA funded ValProj (http://www.terrafirma.eu.com/product_validation.htm) and passed an assessment to be a certified service provider.