Applications of Remote sensing and GIS in Landslide Hazard Analysis
Landslides are very unpredictable events that take place in the hilly regions. In India, annual losses due to landslides are estimated at $1 billion or more. The fatalities that are caused by landslides cannot be counted in monetary form. A landslide depends upon various factors like slope, type of soil, geology of area, construction activities, land use of the area etc. One can forecast the landslide potential of an area with the help of remote sensing data. The remote sensing data about the different factors on which the occurrence of landslide events depend upon can be incorporated in Geographical Information System environment and the cumulative effect of these factors can be estimated.
Satellite imagery and remote sensing data can be used to know the effect of different factors on which the occurrence of a landslide event depends upon. This data is processed in Geographical Information System (GIS). Each factor responsible for the occurrence of landslide is taken into account and then their combined effect can be calculated in GIS environment. The final outputs are validated by field surveys. One can vary the inputs to get better output in GIS system.
Landslide Hazard Zonation
Landslide Risk Assessment
Routine Maintainace Prioritization of Slopes
Alternative Route Studies
Landslide Disaster Management and Hazard Mitigation
Real Time Monitoring of Landslides
PROS and CONS
• In this system one can get better results by varying the inputs.
• The occurrence of landslides can be predicted before its occurrence in some applications which can save huge amount of money and fatalities.
• Sophisticated softwares and geospatial tools are used
• Acquiring and processing satellite imagery is a difficult and time consuming task
In hilly regions, landslides are a big problem but this factor is not considered in the planning of structures like road, bridges etc. As the human impact increases in any region, it makes the slopes more susceptible to landslides. So, the studies on landslides can help in better planning of civil engineering structures. With the accurate use of satellite data and studying the features of the topography of the area, one can forecast the landslide occurrence before it happens.
Robert L. Schuster, Robert W. Fleming,’Economic Losses and Fatalities Due to Landslides’