To obtain highly accurate displacement estimates, geodetic position measurements need to be processed. For GPS raw data, there are several (new) challanges involved with processing because here we use low-cost (i.e. single frequency) stations in urban areas. This means that power-supply cannot be assured, thus the data chain suffers from completness. Also the general rock glacier orientation (N to NW orientated slopes) has an effect for satellite trace coverage which generally is good towards the south.