Geospatial Technologies in the Mapping of Landslide Hazard Zonation
Landslides are magnificent natural disasters that disturb the land areas of the nations of the world. Past history reveals that landslides are causing dangerous consequences which are causing large scale losses like economy, life and directly affecting the nation’s infrastructure. They are the greatest common hazards take place, especially in high mountainous regions. In order to diminish the vast disastrous potential of landslides and to reduce the consequent losses, it is essential to recognize the landslide hazard, the risk should be examined and applicable strategy should be developed at the national level to mitigate the impact of landslide. The present research area, part of Tirumala Hill region of Chittor district, Andhra Pradesh, is prone to landslides, and affecting by landslides from the past several years. In the research study area, an effort made to generate the landslide hazard zonation mapping by using geospatial technologies. In this research, several influencing factors are considered in the preparation of landslide hazard zonation mapping. The major factors are Drainage Density, Geomorphology, Lineament Density, Land Use / Land Cover, Geology, Slope and Elevation. Weighted overlay analysis of geospatial technology is used in the preparation of the landslide hazard zonation mapping of Tirumala hills. The integrated output map exhibits the areas which are prone to occurrence of landslides by means of different zones with the range of vulnerability. The output of Landslide Hazard Zonation map of Tirumala hills is generated with four zones mentioning high, moderate, low and very low vulnerability using geospatial technologies.