Inversion of Subsidence Based on TemporalInSAR Method in Tanggu Area

Objective The temporal InSAR technique overcomes the temporal/spatial decorrelation with the slowdecorrelating filtered phase(SDFP)pixels identified by phase stability.In this paper,the Tanggu are-a has been selected as study area,where the subsidence information due to groundwater overexploita-tion from May 1992to December 1998has been inversed by processing 19ERS-1/2acquisitions usingthe temporal InSAR method.The subsidence in time of the SAR imaging has been estimated accurate-ly using cubic polynomial model.And the result derived from temporal InSAR was consistent with thelevel data which was regarded as GCPs with a little difference that less than 5mm/a.Besides,the re-sult also showed that the whole study area has suffered subsidence with a mean rate 20～50mm/a dur-ing 1992to 1998,and the subsidence is severity in the eastern.