Journal
JOURNAL OF DISASTER RESEARCH
Volume 12, Issue -, Pages 646-655Publisher
FUJI TECHNOLOGY PRESS LTD
DOI: 10.20965/jdr.2017.p0646
Keywords
2016 Kumamoto earthquake; building damage mapping; ALOS-2/PALSAR-2; synthetic aperture radar; machine learning
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Funding
- JST CREST Project [JPMJCR1411]
- China Scholarship Council (CSC)
- Grants-in-Aid for Scientific Research [15KK0226, 16F16055] Funding Source: KAKEN
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Synthetic Aperture Radar (SAR) remote sensing is a useful tool for mapping earthquake-induced building damage. A series of operational methodologies based on SAR data using either multi-temporal or only post-event SAR images have been developed and used to serve disaster activities. This presents a critical problem: which method is more likely to obtain reliable results and should be adopted for disaster response when both pre- and post-event SAR data are available? To explore this question, this study takes the 2016 Kumamoto earthquake as a case study. ALOS2/PALSAR-2 SAR images were employed with a machine learning framework to quantitatively compare the performance of building damage mapping using only post-event SAR images and mapping using multitemporal SAR images. The results show that an overall accuracy of 64.5% was achieved when only post-event SAR images were used, which is 2.3% higher than the overall accuracy when multi-temporal SAR images were used. The estimated building damage ratio for the former and the latter are 29.7% and 31.1%, respectively, which are both close to the building damage ratio obtained from an optical image.
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