GIS-Based Landslide Hazard Mapping Along NH-3 in Mountainous Terrain of Himachal Pradesh, India Using Weighted Overlay Analysis

Landslide is the one of the most devastating geohazard in mountainous terrain that accounts for injury to human life and destruction in the property. It is a major concern due to an increasing trend of frequency of events especially in Himalayas. The present study presents a methodology for mapping of landslides in geographical information system (GIS) environment using remote sensing techniques. The methodology integrates the ground-based observations with geospatial technology. SRTM satellite dataset, slope aspect, slope degree, curvature, lithology, landuse/landcover and drainage density has been incorporated into GIS to demarcate the landslide hazard zones using weighted overlay method (WOM). The results of the study divide the area into very low hazard, low hazard, medium hazard and high hazard and very high hazard zones conferring to the severity of the landslides. The output map produced from the current study helps to plan and execute appropriate landslide mitigation strategies concerned in landslide risk reduction. Moreover, the study may also be beneficial for planning land-use activities in the study area.