Study on Urban Area Subsidence Monitoring Based on InSAR Technique

Based on open source software platform DORIS and self-developed software modules for baseline errors correction and atmospheric delay effects mitigation,ENVISAT SAR data(2003-2007) of Langfang and Shengfang town area are processed.12 GPS stations' data are used to mitigate the atmospheric delay effects in interferograms.SRTM3 DEM is introduced to estimate the residuals of flatten earth effects.The center locations of the subsidence cones are calculated and the annual subsidence rates in these areas are precisely acquired.