期刊
REMOTE SENSING OF ENVIRONMENT
卷 132, 期 -, 页码 212-220出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2013.01.018
关键词
Synthetic Aperture Radar; Radar polarimetry; Earthquake; ALOS PALSAR
资金
- Improvement of Independent Research Environment for Young Researchers program
- special coordination funds for Promoting Science and Technology, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
The 2011 magnitude 9.0 Tohoku earthquake caused catastrophic damage to coastal areas in northeastern Japan. It is quite difficult to obtain an immediate assessment of large-scale natural disasters by ground survey. Microwave remote sensing by airborne or spaceborne sensors is a suitable tool for monitoring near-real-time damage over large areas. However, it is not always possible to acquire datasets with sufficient spatial and temporal resolutions for the precise detection of large areas of damage; therefore, this study focuses on the application of fully polarimetric scattering observations for deduction of information about damaged areas. Earthquake-induced changes in the radar backscattering mechanism are investigated by polarimetric scattering mechanism indicators. In addition, a change detection technique using the Expectation-Maximization (EM) based thresholding approach is applied to various polarimetric features. Furthermore, a new polarimetric information fusion method based on the contextual Markov Random Field (MRF) is proposed. The mapping accuracy for tsunami-swept urban areas can be improved by about 50% with significant reduction of false- and missed-alarm rates compared with the single-polarization SAR approach. (C) 2013 Elsevier Inc. All rights reserved.
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