GENERATION OF EVACUATION SUPPORT INFORMATION BY APPLYING A DIGITAL ELEVATION MODEL -Focused on the Takamatsu City, Kagawa Prefecture of Japan-

Abstract

 With the progress of topographical measurement technology, the use of various differential data obtained by subtracting ground height data from measurement data, such as the ground surface structure, is drawing attention. In particular, we can evaluate the digital surface model (DSM), including ground surface structure, and digital elevation model (DEM) by focus ing on the altitude. From DSM to buildings, etc., windows are used to reduce data in large height directions locally, and the data of ground surface structures are averaged, but since the structures are diverse, it is local. In some cases, the altitude value cannot be estimated exactly. Thus, the differential data between DSM and DEM do not necessarily represent the height of the ground surface structure; however, it can be said to be the data indicating the presence or absence of an object. Therefore, in t his study, we proposed a method of estimating the relationship between the differential data of DSM-DEM, which is treated as noise when obtaining DEM from DSM, and the distribution of ground surface structures. Further, we us ed the estimated relationship a s evacuation support information.