Detection of Collapsed Buildings after the 2007 Niigata Chuetsu-oki Earthquake based on Aerial Photogrammetry

Abstract

The collapsed buildings in Kashiwazaki city due to the 2007 Niigata Chuetsu-oki earthquake are detected based on aerial photogrammetry using digital aerial images. The digital surface models in the area where severe damage incidents were observed after the earthquake are constructed using the digital aerial images. The pre- and post-event aerial images are employed to develop digital surface models in this study. The differences of building heights between the pre- and post-event 3D models are considered to detect collapsed buildings and the accuracy of the method is discussed.