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JMT 2013, Vol. 21 Issue (4) :236-246    DOI: 10.1007/s40534-013-0030-y
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Monitoring subsidence rates along road network by persistent scatterer SAR interferometry with high-resolution TerraSAR-X imagery
Bing Yu, Guoxiang Liu, Rui Zhang, Hongguo Jia, Tao Li, Xiaowen Wang, Keren Dai, Deying Ma*
Department of Remote Sensing and Geospatial Information Engineering, Southwest Jiaotong University, 111 North 1st Section, 2nd Ring Road, Chengdu 610031, Sichuan, China

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Abstract Ground subsidence is one of the key factors damaging transportation facilities, e.g., road networks consisting of highways and railways. In this paper, we propose to apply the persistent scatterer synthetic aperture radar interferometry (PS-InSAR) approach that uses highresolution TerraSAR-X (TSX) imagery to extract the regional scale subsidence rates (i.e., average annual subsidence in mm/year) along road networks. The primary procedures involve interferometric pair selection, interferogram generation, persistent scatterer (PS) detection, PS networking, phase parameterization, and subsidence rate estimation. The Xiqing District in southwest Tianjin (China) is selected as the study area. This district contains one railway line and several highway lines. A total of 15 TSX images covering this area between April 2009 and June 2010 are utilized to obtain the subsidence rates by using the PS-InSAR (PSI) approach. The subsidence rates derived from PSI range from -68.7 to -1.3 mm/year. These findings show a significantly uneven subsidence pattern along the road network. Comparison between the PSI-derived subsidence rates and the leveling data obtained along the highways shows that the mean and standard deviation (SD) of the discrepancies between the two types of subsidence rates are 0.1 and ±3.2 mm/year, respectively. The results indicate that the high-resolution TSX PSI is capable of providing comprehensive and detailed subsidence information regarding road networks with millimeter-level accuracy. Further inspections under geological conditions and land-use categories in the study area indicate that the observed subsidence is highly related to aquifer compression due to groundwater pumping. Therefore, measures should be taken to mitigate groundwater extraction for the study area.
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Articles by authors
Bing Yu
Guoxiang Liu
Rui Zhang
Hongguo Jia
Tao Li
Xiaowen Wang
Keren Dai
Deying Ma
KeywordsSubsidence   Road network   Persistent scatterer interferometry   TerraSAR-X   Highway   Railway     
Received 2013-10-13;
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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

Corresponding Authors: Guoxiang Liu, e-mail: rsgxliu@swjtu.edu.cn     Email: rsgxliu@swjtu.edu.cn
About author: Bing Yu, e-mail: rsbingyu@gmail.com
Cite this article:   
Bing Yu, Guoxiang Liu, Rui Zhang, Hongguo Jia, Tao Li, Xiaowen Wang, Keren Dai, Deying Ma.Monitoring subsidence rates along road network by persistent scatterer SAR interferometry with high-resolution TerraSAR-X imagery[J]  JMT, 2013,V21(4): 236-246
URL:  
http://jmt.swjtu.edu.cn/EN/10.1007/s40534-013-0030-y      or     http://jmt.swjtu.edu.cn/EN/Y2013/V21/I4/236
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