Validation of the result from permanent scatterer inSAR in Shanghai

This paper discusses the validation of the data sets of Permanent Scatterer (PS) technique. The test area is chosen in the main town of Shanghai. Using 26 scenes of ERS-1/2 images within 1993 to 2000, more than 22,000 Permanent Scatterers (PSs), data sets of PS technique, are derived. Because of the linear model of them in time series, the main points of this validation is their spatial distribution and accuracy of subsidence, which include both the quantifiable velocity field and the surface characters of some typical PSs on the earth. Field survey presents the location and surface characters of PSs. The comparison between PSs and optical leveling is made by two interpolation methods, nearest neighbor and kriging interpolation. High accuracy of PS's land subsidence of about 2mm is obtained in this experiment.