ASSESSMENT AND PREPARATION OF LANDSLIDE SUSCEPTIBILITY ZONATION MAP BY GEOSPATIAL METHOD USING REMOTE SENSING AND GIS

摘要

Landslide is the most affecting natural Hazard of any hilly region. It occurs due to changes in different aspects like slope, drainage, land use and land cover, lithology, geological conditions, etc. It is the disaster that directly affects the socio-economical condition of any region. Landslide Susceptibility Zonation (LSZ) Map is required to prevent landslide as well as the socio-economical losses of the hilly region. The availability of various Remote Sensing (RS) data and the advancement of the Geographic Information System (GIS) help to prepare the LHZ map. The integration of RS data and GIS application is adopted to generate the LHZ map of Darjeeling, India. Landsat 8, Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER) Data Elevation Model (DEM), and different Information maps are used to prepare six thematic layers for LHZ such as Slope, Drainage Density, Lineament, Geology, Land use & Land Cover, Soil. Thematic layers were assigned appropriate Numerical values as the weight for every factor and sub-factor in the GIS environment. The LHZ maps were produced by the weighted overlay technique. Resulted from it gives the LHZ map of the Darjeeling area. Further zoned into four classes as followed, Low, Moderate, High, and Very High. Later the map was validated by field data and geospatial analysis.