Landslide Hazard Assessment Using GIS

Landslides are one of the main natural disasters, and the landslide hazard assessment has become a major concern for the mountain area development. Geographic Information Systems (GIS), with its excellent spatial data process ability, has attracted a great attention in natural disaster assessment. This book discusses, the GIS-based landslide hazard assessment, which is one of geotechnical engineering approaches based on the physical term, is considered as an acceptable method for analyzing the safety factor of the landslide and for mapping three-dimensionally and probabilistically landslide hazard. Combining the GIS grid-based data with four proposed column-based models of 3D slope stability analysis, correspondent GIS grid-based 3D deterministic models have been devised to calculate the safety factor of the slope. Based on the four GIS-based 3D slope stability analysis models, a GIS-based program, 3DSlopeGIS, has been developed to implement the algorithm where the whole of the input data is in the same form as the GIS dataset. Using the GIS grid-based 3D deterministic model and taking the slope unit as the mapping unit, the 3D safety factor index and failure probability are used for mapping landslide hazard. The method has been applied to some case study on three-dimensionally and probabilistically mapping landslide hazard.