landslide susceptibility mapping of north sikkim using geospatial techniques (original) (raw)

Assessment of landslide is an important aspect for evaluation, zoning and risk management .Numerous methods and techniques were discussed by the researchers for landslide hazard zonation mapping of different landslide sensitive zones of the world for decision making. The Present research work is an integrated approach of geospatial technology for landslide susceptibility mapping for part of North Sikkim Himalaya using spatial Analyst tool of ARC GIS software. The important factors which are necessary landslide susceptibility mapping in hard rock terrain particularly for Himalayan region such as geology/structure, drainage density, Land use /land cover and slope were discussed and evaluated by using satellite images , field based data and published maps. All the extracted thematic maps were reclassified on the basis of their importance and characteristics for landslide susceptibility mapping of the area under GIS environment by applying weighted Overlay method in ARC GIS. Finally integrated landslide susceptibility map of the area generated and classified under four major categories from low to very high landslide susceptibility zones. Keywords: Landslide Susceptibility Mapping, Remote Sensing, ARC GIS, North Sikkim Himalaya.