Disaster analysis using archival aerial photographs with SfM/MVS technology

Abstract

Application of Structure-from-Motion (SfM) and Multi-View Stereo (MVS) to archival aerial photographs enables quantitative re-examination of terrain and surface changes caused by past disasters. This study reassessed three types of historical disasters－volcanic eruptions, landslides, and windthrow events－through differential analysis of pre- and post-event digital surface models (DSMs) reconstructed from the imagery. The SfM/MVS-derived DSMs captured volcanic terrain changes such as scoria-cone formation and lava-flow emplacement, and quantitatively delineated areas affected by landslides and windthrow.