Author(s)

M. Mori

Abstract

Over the two-day period of 19–20 July, 2003, the Kyushu area of Japan was hit with heavy rainfall, causing many kinds of disasters in various areas. A total of 1,352 houses were flooded in Fukuoka City when the Mikasa River overflowed its banks. For our research, the flooded area was estimated by a threedimensional (3D) Geographic Information Systems (GIS). A high-resolution Digital Elevation Model (DEM) (10 m meshed grid) has been integrated with GIS so as to construct a 3D GIS model in the region around the Mikasa River Basin. An area of 10 m DEM has been developed by a commercial company, which offers up to 0.1 m resolution in a vertical direction, and also covers the entire country of Japan. Resolution in the vertical direction is sufficient for construction of our model. The three-dimensional buildings database in Fukuoka City is used to construct the model, which includes 3D structure. The flooded area is estimated with great precision based on 10 m DEM according to water levels from 3.6 m to 5.0 m of the Mikasa River. Three-dimensional views of the flooded area were obtained from several view angles by this system. Keywords: flood, 3D GIS, Digital Elevation Model, 3D view, remote sensing, DEM/DTM, high resolution, graphics. 1 Introduction The heavy rainfall occurred in Fukuoka Prefecture, Japan, on July 19, 2003 [1]. Maximum hourly and accumulated rainfalls were recorded at approximately 90 mm/h and 320 mm. As a result of the storms, the Mikasa River overflowed its

Keywords

flood, 3D GIS, Digital Elevation Model, 3D view, remote sensing, DEM/DTM, high resolution, graphics.