Remote Sensing Applications and Decision Support

Land subsidence in Tianjin for 2015 to 2016 revealed by the analysis of Sentinel-1A with SBAS-InSAR

[+] Author Affiliations
Jiming Guo, Jiyuan Hu

Wuhan University, School of Geodesy and Geomatics, Hongshan District, Wuhan, China

Bing Li

Wuhan University, Chinese Antarctic Center of Surveying and Mapping, Hongshan District, Wuhan, China

Lv Zhou

Wuhan University, School of Geodesy and Geomatics, Hongshan District, Wuhan, China

Beijing Key Laboratory of Urban Spatial Information Engineering, Haidian District, Beijing, China

Guilin University of Technology, Guangxi Key Laboratory for Spatial Information and Geomatics, Qixing District, Guilin, China

Wei Wang

Tianjin Institute of Surveying and Mapping, Xiqing District, Tianjin, China

J. Appl. Remote Sens. 11(2), 026024 (May 31, 2017). doi:10.1117/1.JRS.11.026024
History: Received January 9, 2017; Accepted May 9, 2017
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Abstract.  It has been suggested that Tianjin, China, has significant land subsidence due to excessive extraction of water. Although it is presently under control, the land subsidence around Tianjin suburbs in recent years should not be ignored. However, existing research work on land subsidence is based on traditional synthetic aperture radar satellite images in which the research time spans are mainly before 2012. An advanced time-series method, namely small baselines subset (SBAS) technique, is applied to a total of 27 Sentinel-1A images over Tianjin acquired between May 31, 2015, and May 13, 2016, to derive the subsidence magnitude and distribution of Tianjin. Furthermore, the overall and quantitative validations of SBAS-derived results are implemented. First, the overall subsidence distribution derived by SBAS is compared with the annual report of land subsidence in Tianjin 2015, which shows the same subsidence trend and distribution. Then, 44 benchmarks and 2 continuously operating reference station datasets, i.e., CH01 and XQYY, are processed to provide a specific validation of SBAS-derived results of Sentinel-1A. Finally, through investigation, an interpretation from two aspects of groundwater extraction and geological structures of the surrounding Wangqingtuo settlement funnel area is given.

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Citation

Jiming Guo ; Jiyuan Hu ; Bing Li ; Lv Zhou and Wei Wang
"Land subsidence in Tianjin for 2015 to 2016 revealed by the analysis of Sentinel-1A with SBAS-InSAR", J. Appl. Remote Sens. 11(2), 026024 (May 31, 2017). ; http://dx.doi.org/10.1117/1.JRS.11.026024


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