Abstract

This study investigates the characteristics of backscattering and interferometric synthetic aperture radar (InSAR) coherence for the flood damage area in Koriyama city caused by Typhoon Hagibis (No.19 in Japan, 2019). Nine sites, including built-up and paddy fields, were selected as flooded and non-flooded areas in Koriyama. Backscattering and InSAR analysis were applied to Sentinel-1 C-band synthetic aperture radar(SAR) data. Both backscattering and coherence changes can detect flood-damaged areas in built-up areas. However, InSAR coherence could not detect the flooded paddy fields due to its low coherence. We also applied a principal component analysis (PCA) to multi-temporal backscattering images and found that the second component helped detect flooded areas in both built-up and paddy fields.

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