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《Journal of Tongji University(Natural Science)》 2011-01
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Ground Subsidence Detection of Nantong City Based on PS-InSAR and GIS Spatial Analysis

HE Xiufeng,ZHONG Haibei,HE Min(Institute of Satellite Navigation & Spatial Information System,Hohai University,Nanjing 210098,China)  
The best filter method was proposed and the window size was determined by the structure function to improve the accuracy of extracting the atmospheric effects from the residual phase by filtering in the Permanent scatter interferomentry SAR(PS-InSAR)technique.The linear deformation rate of permanent scatterers was analyzed to examine the distribution of data and detect outliers,and then was interpolated with Kriging method.To verify the method,Nantong was chosen as the test area and 15 Envisat SAR images acquired during period of 2006—2007 were used to detect the ground subsidence of Nantong.The experimental results show that the method can improve the accuracy of the extraction of atmospheric effects.A ground subsidence rate map of Nantong with high resolution is generated.Several subsidence funnels are found in Nantong downtown during the period of 2006—2007.There are not large subsidence funnels in Nantong downtown between 2006 and 2007,and the subsidence rate of most regions in Nantong city is no more than 11 mm annually.
【Fund】: 江苏省科技支撑计划(BE2010316)
【CateGory Index】: P642.26;P208
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