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《Chinese Journal of Geophysics》 2012-10
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Mapping ground 3-D displacement with GPS and PS-InSAR networking in the Pingtung area,southwestern Taiwan,China

CHEN Qiang1,LIU Guo-Xiang1,HU Jyr-Ching2,DING Xiao-Li3,YANG Ying-Hui1 1 Department of Surveying Engineering,Southwest Jiaotong University,Chengdu 610031,China 2 Department of Geoscience,National Taiwan University,Taiwan Taipei 106,China 3 Department of Land Surveying and Geo-Informatics,The Hong Kong Polytechnic University,Hong Kong,China  
It′s promising to map ground 3-D displacement along the north,east and vertical directions combining accurate GPS observations and dense PS-InSAR measurement.This paper computes accurately the orbital azimuth of SAR satellites and analyzes the geometric transformation relationship between InSAR derived deformation in LOS direction and GPS observables.The model is employed to convert InSAR displacement into vertical deformation based on the accurate horizontal displacement from GPS.The selected PS targets and GPS stations are combined to establish a ground deformation monitoring network.The parameter adjustment method is used to estimate vertical displacement of PS.The algorithms are tested and validated using ERS-1/2 SAR images over the Pingtung area and GPS observations from 48 stations in southwestern Taiwan.The horizontal displacement in the Pingtung area is clearly derived from GPS observables;the annual velocity is 30~50 mm/a moving towards the west and the azimuth presents a counter-clockwise deviation towards the southwest.The vertical displacement field is derived from the GPS and PS-InSAR networking with the southern Pingtung plain subsiding at a rate of-10~-15 mm/a,the northern plain and Kaohsiung area uplifting at +5~+10 mm/a.
【Fund】: 国家自然科学基金项目(41072220 51178404);; 中央高校基本科研业务费专项(SWJTU09CX010 SWJTU11ZT13)资助
【CateGory Index】: P228.4
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【Citations】
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