UNSTRUCTURED GRID GENERATION USING LIDAR MEASUREMENT FOR INUNDATION ANALYSIS

Abstract

It is difficult to predict flood flow in urbanized area for the complicated topographical reason. Recently, airborne laser mapping system becomes available, which gives us a very detailed topographical information. In this study, we developed a high resolution inundation analysis system using airborne laser survey results. The system enables an automatic grid generation while detecting location of buildings and streets. We demonstrated the superiority of the new analysis system by applying it to an actual inundation problem due to a tsunami. With this system, it would become possible to construct a high accurate hazard map in urban area.