A Comparative Study on Landslide Susceptibility Mapping Using AHP and Frequency Ratio Approach

Landslide is a naturally occurring phenomenon in most of the mountainous regions of the world. Manipur, being a landlocked hilly state, is continuously facing the problems of landslides in the rainy seasons and the economic conditions are highly affected due to blockages of the highways of the region which served as the lifelines. So it becomes very important to check the problems caused due to this natural disaster. In this particular study, an attempt is being made for developing the landslide susceptibility mapping of the region using two GIS-based landslide susceptibility approaches––Analytic hierarchy approach and Frequency ratio approach. Eight causative factors Land Use Land Cover (LULC), Normalized Difference Vegetation Index (NDVI), slope, aspect, curvature, elevation, rainfall, and soil types are considered in the study. The output landslide susceptibility maps developed by the two different approaches have been compared and validation of both the models have been done using landslide locations of the region. Both the models show good accuracy but the Frequency Ratio shows higher accuracy when compared to the AHP approach.