Analysis of landslide risk areas by applying geographic information systemsand the AHP process in Chiang Rai Province

Abstract

This research is the analysis of landslide risk areas in Chiang Rai Province by applying geographic information systems (GIS) and the Analytic Hierarchy Process (AHP) to find the risk area of landslide and use to manage and prevent landslide event in Chiang Rai Province. The factors of this study are landuse area, water area, contour and slope data. By analyze all data in shapefile format using geographic information systems software and AHP process to rating and weighting all above factors, The result is the risk area map that contain 5 levels of risk area by least to most. The study found that the least risk area is 2.87 percent, less risk area is 26.58 percent, moderate risk area is 35.36 percent, more risk area is 32.59 percent and the most risk area is 2.61 percent. This result can be used to monitor and prepare for any landslide event in Chiang Rai Province including the preventive planning in the long term such as planting cover crops, vetiver grass, ditch and weirs.