Subsidence monitoring using SAR interferometry time series analysis along the Chao Phraya river areas

We apply a SAR Interferometry (InSAR) time series analysis to monitor ground deformations in the Lower Chao Phraya Basin, Thailand, using ALOS (Advanced Land Observing Satellite) PALSAR (Phased Array type L-band SAR) data acquired between July 2007 and September 2010. A smoothness-constrained inversion algorithm that optimizes the displacement from the phase unwrapping of multitemporal differential SAR interferograms is used. The SAR Interferometry time series analysis succeeds to monitor the incremental line-of-sight (LOS)-change between SAR scene acquisitions. We compare obtained time-dependent results with previous leveling surveys and conventional InSAR studies and find an overall consistency in the deformation estimates. This verifies the validity of the method and data used.