国土地理院における高解像度DEMの整備とそれを活用した地理情報解析研究

概要

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About ten years have passed since airborne LiDAR (light detection and ranging) surveys practically began in Japan, and now we can produce a more detailed digital elevation model (DEM) using airborne LiDAR than using photogrammetry. Since 2003 the Geospatial Information Authority of Japan (formerly Geographical Survey Institute) has surveyed topography using LiDAR, produced DEMs, and published the dataset "Digital Map 5m Grid (Elevation)" to cover many areas in Japan. In 2007 the Basic Act on the Advancement of Utilizing Geospatial Information (NSDI [National Spatial Data Infrastructure] Act of Japan) and the Ordinance for the NSDI Act were in force. In this paper, we introduce the characteristics and specifications of this DEM dataset and explain the relation between the DEM dataset and the Ordinance for the NDSI Act. Furthermore, we introduce our LiDER-DEM studies such as the evaluation of accuracy of LiDAR measurement, assessment of landslide susceptibility, detecting land deformation induced by an earthquake, measurement of snow depth, and automated vegetation mapping for landscape-ecological studies.
2010-10-25