Fig.1 @Maps of the geomorphological land classification in Arakawa-ward, Tokyo. (a) The original map (National Land Agency, 1992). (b) The map digitized from the original map. (c) 500 m meshes and the central points in each mesh. (d) Dizitized map of 500 m meshes. (e) Map of the geomorphological land classification of the digital national land information (1 km mesh, Japan Map Center, 1992).