Deformation Trend Extraction Based on Multi-Temporal InSAR in Shanghai

Remote Sensing

Jie Chen¹  Jicang Wu¹  Lina Zhang¹  Junping Zou²  Guoxiang Liu³  Rui Zhang³ 

[1] College of Surveying and Geoinformatics, Tongji University, Shanghai 200093, China; E-Mails:;Shanghai Institute of Surveying and Mapping, Shanghai 200063, China; E-Mail:;Department of Remote sensing and Geospatial Information Engineering, Southwest Jiaotong University, Chengdu 610031, China; E-Mails:

关键词: MT-InSAR;    deformation monitoring;    non-uniform subsidence;    validation;    ASAR;    CSK;    IPTA;   

DOI  :  10.3390/rs5041774

来源: mdpi

【 摘 要 】

Shanghai is a modern metropolis characterized by high urban density and anthropogenic ground motions. Although traditional deformation monitoring methods, such as GPS and spirit leveling, are reliable to millimeter accuracy, the sparse point subsidence information makes understanding large areas difficult. Multiple temporal space-borne synthetic aperture radar interferometry is a powerful high-accuracy (sub-millimeter) remote sensing tool for monitoring slow ground deformation for a large area with a high point density. In this paper, the Interferometric Point Target Time Series Analysis method is used to extract ground subsidence rates in Shanghai based on 31 C-Band and 35 X-Band synthetic aperture radar (SAR) images obtained by Envisat and COSMO SkyMed (CSK) satellites from 2007 to 2010. A significant subsidence funnel that was detected is located in the junction place between the Yangpu and the Hongkou Districts. A t-test is formulated to judge the agreements between the subsidence results obtained by SAR and by spirit leveling. In addition, four profile lines crossing the subsidence funnel area are chosen for a comparison of ground subsidence rates, which were obtained by the two different band SAR images, and show a good agreement.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland