Measuring coseismic displacements with point-like targets offset tracking
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Earth Science and Engineering Program
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AbstractOffset tracking is an important complement to measure large ground displacements in both azimuth and range dimensions where synthetic aperture radar (SAR) interferometry is unfeasible. Subpixel offsets can be obtained by searching for the cross-correlation peak calculated from the match patches uniformly distributed on two SAR images. However, it has its limitations, including redundant computation and incorrect estimations on decorrelated patches. In this letter, we propose a simple strategy that performs offset tracking on detected point-like targets (PT). We first detect image patches within bright PT by using a sinc-like template from a single SAR image and then perform offset tracking on them to obtain the pixel shifts. Compared with the standard method, the application on the 2010 M 7.2 El Mayor-Cucapah earthquake shows that the proposed PT offset tracking can significantly increase the cross-correlation and thus result in both efficiency and reliability improvements. © 2013 IEEE.
SponsorsManuscript received August 17, 2012; revised February 25, 2013; accepted March 25, 2013. Date of publication June 11, 2013; date of current version November 8, 2013. This work was supported in part by the National Key Basic Research Program of China under Grant 2013CB733205, the National Natural Science Foundation of China under Grants 41271457 and 41021061, the National High Technology Research and Development Program of China under Grant 2011AA120404, and the Research Fund for the Doctoral Program of Higher Education of China under Grant 20110141110057.