Special Issue (Civil Engineering Infomatics) Paper
ANALYSIS OF THE BUILDING DAMAGE OF THE KUMAMOTO EARTHQUAKE BY ALOS-2/PALSAR-2 DATA WITH MULTIPLE ACQUISITION CONDITIONS
2023 Volume 79 Issue 22 Article ID: 22-22001
Details
2023 Volume 79 Issue 22 Article ID: 22-22001
The authors have been developing a method to assess the building damage at the district level in heavily damaged areas using satellite-derived SAR data, and conducted the coherence analysis of urban areas. In this study, we focus on the Kumamoto earthquake to clarify the relationship between the coherence and the building damage rate using ALOS-2 PALSAR-2 images in the L-band under multiple acquisition conditions (different orbits, looking directions). The analysis area was Mashiki-Town, Kumamoto Prefecture, and we evaluated the relationship between the average coherence value and the building damage rate within a 200-meter mesh in Mashiki-Town. The results showed that there was a significant negative correlation regardless of the acquisition conditions, and revealed that the smaller the building damage rate, the larger the coherence variation. Three indices of the building damage were examined based on the field survey data, but no significant differences were found among them.
