Comparative analysis in GIS-based landslide hazard zonation—a case study in Bodi-Bodimettu Ghat section, Theni District, Tamil Nadu, India

The aim of this research article is to assess and compare the reliability of spatial-based different landslide hazard zonation mapping methods in the Bodi-Bodimettu Ghat section, Theni District as a case study. In favor of this intention, the three methods like the Bureau of Indian Standard (BIS), multi-criteria analysis (MCA), and frequency ratio (FR) model have been applied to find out three different landslide hazard zonation maps. The results of the three methods were compared using parameters such as landslide density, success rate curve, and spatially agreed area. Approximately the same variation is seen in the final results of BIS in comparison to the other methods, namely MCA and FR. But if we go actually into the detail, low hazard and moderate hazard seem to merge to indicate one single zone made as moderate hazard. Moreover, the nature of weightages used in different techniques may have the same influence on the outcome of the result.

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