ABSTRACT
A digitizer was used to simplify reading and input effort of geographical information data. Contour lines were read with a digitizer from a topographical map, and altitude data in 25m meshes were calculated using these contour lines. Slope shape items were calculated from the altitude data of these 25m meshes. The failure risk prediction of a slope was done from geographical information databases and risk evaluation points. Furthermore, by using these results, the authors made useful hazard maps for predicting slope failures in heavy rain and identifying dangerous locations where further field investigations are necessary.
