Journal
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
Volume 11, Issue 1, Pages 283-287Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2013.2256104
Keywords
Offset tracking; point-like targets; synthetic aperture radar interferometry (InSAR)
Categories
Funding
- National Key Basic Research Program of China [2013CB733205]
- National Natural Science Foundation of China [41271457, 41021061]
- National High Technology Research and Development Program of China [2011AA120404]
- Research Fund for the Doctoral Program of Higher Education of China [20110141110057]
- Division Of Earth Sciences
- Directorate For Geosciences [1261833] Funding Source: National Science Foundation
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Offset 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.
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