Landslides in relation to terrain parameters - A Remote Sensing and GIS approach
 S. Sarkar archana@nih.ernet.in  D.P. Kanungo Geotechnical Engineering Division Central Building Research Institute, Roorkee
Abstract
Landslide occurrence depends on the inter-play of several parameters and therefore it is imperative to know the contribution of these parameters on slope instability. In the present study, three terrain parameters drainage, lineament and road have been considered. The paper describes the utility of remote sensing and GIS for generation of these thematic layers and an integrated approach to evaluate layer-wise influence on landslide occurrence in parts of Darjeeling Himalaya. Introduction Landslide is the result of a wide variety of processes which include geological, geomorphological and meteorological factors. The important terrain factors are lithology, structure, drainage, slope, landuse, geomorphology and road network. A complete landslide hazard assessment requires an analysis of all these factors leading to instability in the region. The feature extraction of some of these factors can be done from the interpretation of satellite images. With the increase in efficient digital computing facilities, the digital remote sensing data and their analysis have gained enormous importance. Then the spatial and temporal thematic informations derived from remote sensing and ground based information need to be integrated for data analysis. This can be very well achieved using GIS which has the capabilities to handle voluminous spatial data. With the help of GIS, it is possible to integrate the spatial data of different layers to determine the influence of the parameters on landslide occurrence. The present paper describes the generation of the four thematic layers; drainage, lineament, road and landslide. An attempt has been made to evaluate the relationship between these factors and landslides in the terrain using GIS technique.  Fig.1: Landslide map of Darjeeling Himalaya
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