Measuring coseismic displacements with point-like targets offset tracking

Xie Hu, Teng Wang, Mingsheng Liao

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

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. © 2013 IEEE.
Original languageEnglish (US)
Pages (from-to)283-287
Number of pages5
JournalIEEE Geoscience and Remote Sensing Letters
Volume11
Issue number1
DOIs
StatePublished - Jan 2014

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Electrical and Electronic Engineering

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