Method and Accuracy of Extracting Surface Deformation Field from SAR Image Coregistration

doi:10.11947/j.AGCS.2015.20130782

Abstract

Abstract: InSAR can extract one-dimensional deformation along the line of sight of radar. SAR image coregistration and pixel offsets can be used to extract two-dimensional deformation along the azimuth and range directions, and can be considered as the significant complement for InSAR deformation measurement. Analyzing the method of extracting deformation field with the SAR image coregistration and pixel offsets, this paper presents the error model of deformation extraction along the azimuth and range directions. The main error components for deformation extraction from the pixel offsets are addressed. The experiments of coseismic deformation field extraction and error analysis are carried out with ASAR images of Bam earthquake and PALSAR images of Yushu earthquake. The results show that the coseismic deformation extraction accuracy is significantly affected by matching window size and oversampling factor. The deformation extraction error decreases with the increase of matching window size, and deformation extraction accuracy can be slightly improved with the increase of oversampling factor. Terrain effect can cause significant pixel displacements in SAR images over high-relief areas.

Key words: SAR image coregistration, pixel offset, coseismic deformation, accuracy analysis, terrain effect

CLC Number:

P237

CHEN Qiang, LUO Rong, YANG Yinghui, YONG Qi. Method and Accuracy of Extracting Surface Deformation Field from SAR Image Coregistration[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(3): 301-308.

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