THE BASIC STUDY ON ACCURACY OF FLOODING ANALYSIS USING 1M RESOLUTION ELEVATION DATA AND EVALUATION OF HOUSE COLLAPSE

Abstract

 One of the important factors for highly accurate inundation analysis is the elevation resolution and the grid resolution. In this study, we conducted inundation analysis using Hyogo 1m resolution elevation data compared with 5-meter resolution elevation data by the Geospatial Information Authority of Japan (GSI), and examined the differences by the resolution of inundation analysis. It was found that using 1m elevation resolution data resulted more accuracy to the roads than 5m. In addition, we indicated that inundation analysis by using the accurate building shapes and 5-meter resolution elevation becomes similar to 1-meter. Afterwards, it was found that the importance of taking into account the characteristics of individual buildings in the collapse evaluation.