Monitoring land subsidence by PS-DInSAR and SBAS methods in Tianjin City

Hongdong Fan; Kazhong Deng; Chuanguang Zhu; Jiqun Xue

doi:10.1117/12.912344

24 October 2011 Monitoring land subsidence by PS-DInSAR and SBAS methods in Tianjin City

Hongdong Fan, Kazhong Deng, Chuanguang Zhu, Jiqun Xue

Proceedings Volume 8286, International Symposium on Lidar and Radar Mapping 2011: Technologies and Applications; 82861J (2011) https://doi.org/10.1117/12.912344
Event: International Symposium on Lidar and Radar Mapping Technologies, 2011, Nanjing, China

Abstract

Because of groundwater over-exploitation, the land subsidence of Tianjin city has become more and more serious. Some researchers tried to use D-InSAR technique to monitor the subsidence of this area. However, D-InSAR has some problems such as space and time baseline decorrelation and atmospheric influence. In order to obtain long time series land deformation with high accuracy, SAR image set to monitor land subsidence has become a research focus. PSDInSAR (Persistent Scatterers-DInSAR) and SBAS (Small Baseline Sets) are two classical methods to monitor land subsidence by SAR images. The former chooses one image as the master and the latter chooses several images as the masters according to the threshold of baselines. Using eighteen ERS images and SRTM DEM data the land subsidence of Tianjin city from 1992 to 1998 was obtained by two methods mentioned. 18906 and 42041 PS points were identified respectively by PS-DInSAR and SBAS. While, 16.4 mm/a and 24.2 mm/a of the mean maximal subsidence velocities were obtained respectively. Although they are different in values, the distributions and subsidence laws of points are nearly same.

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Hongdong Fan, Kazhong Deng, Chuanguang Zhu, and Jiqun Xue "Monitoring land subsidence by PS-DInSAR and SBAS methods in Tianjin City", Proc. SPIE 8286, International Symposium on Lidar and Radar Mapping 2011: Technologies and Applications, 82861J (24 October 2011); https://doi.org/10.1117/12.912344

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KEYWORDS

Picosecond phenomena

Synthetic aperture radar

Image processing

Mining

Coherence (optics)

Interferometric synthetic aperture radar

Atmospheric monitoring

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