GIS와 원격탐사를 이용한 한국 보은지역의 산사태 위험도 분석

Abstract

The aim of this study is to evaluate the hazard of landslides at Boun, Korea, using a Geographic Information System (GIS) and remote sensing. Landslide locations were identified in the Boun area from interpretation of aerial photographs and field surveys. The topographic, soil, forest, geologic, lineament and land cover data were collected, processed and constructed into a spatial database using GIS and remote sensing data. The factors that influence landslide occurrence, such as slope, aspect and curvature of the topography, were calculated from the topographic database. Texture, material, drain-age and effective soil thickness were extracted from the soil database, and type, age, diameter and den-sity of timber were extracted from the forest database. The lithology was extracted from the geological database and lineaments were detected from IRS satellite images. The land cover was classified based on the Landsat TM satellite image. Landslide hazard areas were analyzed and mapped, using the land-slide-occurrence factors, by the probability–likelihood ratio method. The results of the analysis were verified using actual landslide location data. The validation results showed satisfactory agreement be-tween the hazard map and the existing data on landslide locations.