二時期SAR強度画像を用いた土砂移動箇所判読精度の検証 －平成29年7月九州北部豪雨の事例－

抄録

We verified the detection capability of landslides using SAR images taken before and after the heavy rainfall in northern Kyushu in July, 2017. We have successfully detected about 70% of the landslides that occurred on the slopes facing away from the radar. The landslide detection accuracy tends to be higher where the local incidence angle is large. If these conditions are met, we are able to detect a relatively small landslide with the area of about 2,500 m².This is a quarter area of a landslide that was detected in previous studies. By using multi-temporal SAR images, the changes on the ground surface conditions can be detected with 90% accuracy.