Monitoring of surface subsidence using PSInSAR with TerraSAR-X high resolution data
DING Rongrong1, XU Jia1, LIN Xiaobin2, XU Kang3
1. School of Earth Science and Engineering, Hohai University, Nanjing 210098, China;
2. Fujian Port Management Bureau Survey Center, Fuzhou 350009, China;
3. Jiangsu Province Surveying & Mapping Engineering Institute, Nanjing 210013, China
In this study, interferometric point target analysis (IPTA) was used to monitor the surface subsidence of Changzhou City caused by factories' immoderate exploitation of groundwater on the basis of thirty-seven TerraSAR-X high resolution stripmap data collected in this area between October 2011 and July 2013. The results showed that several settlements appeared in Wujin area of Changzhou City, with the largest average subsidence rate up to 31.494 mm/a; A comparison with the average settlement rate of ASAR data shows that TerraSAR-X data could not only improve high density of PS points but also describe detailed changes and the micro-displacement situation of the scattering object, which indicates the advantages of TerraSAR-X high resolution stripmap data applied to monitoring the surface deformation. In this paper, the monitoring of land subsidence along Shenhai expressway of Changzhou by TerraSAR-X data reflects the prospects of TerraSAR-X data in monitoring artificial linear features. The survey results of bench mark verify the consistency of monitoring results and the reliability of IPTA used to monitor the surface subsidence in the city.
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2015, Vol. 27 
