Monitoring Land Deformation Using PSInSAR with TerraSAR-X High Resolution Spotlight SAR Images

Persistent scatterer InSAR was used to detect surface subsidence in the area around the Yangbajing geothermal power plant due to extraction of ground water with twenty high resolution TerraSAR-X spotlight SAR images collected between March and November 2010.The results suggest that land subsidence in the areas of geothermal wells is up to 25 mm·a-1 whilst the subsidence in the basin is less than 1 mm·a-1.And the correlation between TerraSAR-X and ASAR derived mean velocities is 0.76.TerraSAR-X high resolution spotlight SAR images can provide higher density of PS points than ASAR data,and also can reveal the detail change and micro-displacement in a single ground object.