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Proceedings Paper

Mapping earthquake-induced damage of the Wenchuan earthquake using SAR data
Author(s): Yunhua Liu; Xinjian Shan; Chunyan Qu; Xiaogang Song; Guifang Zhang
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Paper Abstract

Due to the adverse weather condition such as raining after the Wenchuan earthquake, the applicability of optical imagery in decision making for mitigating earthquake disasters had been highly restricted. As a synthetic aperture radar (SAR) sensor possesses all-weather imaging capability, SAR imagery emerges as a very important data source for earthquake rescue operation at the earlier stage. This paper utilizes 4 pairs of ENVISAT ASAR images (3 pre-earthquake, 1 postearthquake) to perform ratio coherence change detection by comparing pre-seismic between post-seismic images over Dujiangyan City and its neighboring areas. The testing results indicate that the interferometric coherence map is sensitive to physical surface changes and show that there were significant changes within the urban area and the main shock had caused substantial damage. This study demonstrates that it is feasible to use SAR images to conduct damage assessment. With the polarization radar technology becoming more sophisticated, radar satellites in decision making for disaster rescue will play more and more important role.

Paper Details

Date Published: 9 October 2009
PDF: 10 pages
Proc. SPIE 7471, Second International Conference on Earth Observation for Global Changes, 74711C (9 October 2009); doi: 10.1117/12.836312
Show Author Affiliations
Yunhua Liu, China Earthquake Administration (China)
Xinjian Shan, China Earthquake Administration (China)
Chunyan Qu, China Earthquake Administration (China)
Xiaogang Song, China Earthquake Administration (China)
Guifang Zhang, China Earthquake Administration (China)

Published in SPIE Proceedings Vol. 7471:
Second International Conference on Earth Observation for Global Changes
Xianfeng Zhang; Jonathan Li; Guoxiang Liu; Xiaojun Yang, Editor(s)

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