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Since FS 2014 - 15, GSI has launched and undertook a national programme on landslide susceptibility mapping - Macro scale (1:50,000) National Landslide Susceptibility Mapping (NLSM) with an aim to cover the 0.42 million sq. km landslide prone areas of the country. This national programme was formally launched by Shri Dinsha Patel, Hon’ble Minister of Mines, Government of India on 5 February, 2014 at the 53 Central Geological Programming Board Meeting, New Delhi.

Aims and Objectives

  • To create a dynamic National Landslide Susceptibility Geodatabase for India
  • To prepare GIS - based seamless Landslide Susceptibility Maps of India on 1:50,000 scale
  • To prepare a nation-wide repository on GIS-based Landslide Inventory



  • NLSM Targets



    Ongoing and concluded targets




    NLSM
    NLSM
    NLSM
    NLSM
    NLSM

    NLSM Methodology

    Methodology of landslide susceptibility mapping proposed for NLSM can be divided into the following main themes - i) preparation of landslide inventory, ii) preparation of geofactor maps and of its related GIS - based database, iii) Spatial association analysis between various geofactors and landslides for determining ratings of factor classes and weights of the geofactor themes, iv) Knowledge - driven estimation of ratings of factor classes and weights of the geofactor themes through AHP, v) GIS - based modeling for integration of selected and weighted geofactor maps for preparation of landslide susceptibility scores, and vi) classification of landslide susceptibility score maps into qualitative maps showing varying degree of landslide susceptibility using success rate curve.


    NLSM

    NLSM data sources

    Thematic geofactor maps, its source datasets and methods of mapping

     
    Geofactor theme Primary source data
    & methods
    Field validation/  augmentation Final derived geofactor themes & methods
    Slope gradient 30 X 30 m resolution ASTER DEM, GIS functionalities to be used for surface analysis (e.g., 3D Analyst or Spatial Analyst in ArcGIS) - Same as primary
    Aspect -
    Curvature -
    Geomorphology
     
    1:50K Geomorphological and Lineament Map from NLGM Project to be taken as base map; Consultation of IRS P6 LISS-IV MX data, Google Earth data, Toposheets (OSM series)  for further augmentation  Essential Modified and corrected polygons on analog maps need to be digitised in a GIS along with relevant  attribute entries
    Slope Forming Material 1:50K Geological map from GSI; 1:50 Geomorphological Map from NLGM Project; Google Earth data , 1:50K Land use/ cover map to be consulted for preparation of pre-field map Essential Modified and corrected polygons on analog maps need to be digitised in a GIS along with relevant  attribute entries
    Regolith Depth
    Structure
    (Fault/ Lineament)
    1:50K Geological map from GSI; 1:50 Geomorphological Map from NLGM Project to be consulted for preparation of pre-field map; may be cross-checked once through visual examination with IRS P6 LISS-IV   Required Modified and corrected polylines on analog maps need to be digitised in a GIS along with relevant  attribute entries; buffering would be done in a GIS after examining the spatial association with prevalent landslides
    Structure
    (Regional Thrusts/ Faults)
    1:50K Geological map from GSI; 1:50 Geomorphological Map from NLGM Project to be consulted for preparation of pre-field map. - Same as primary
    Land use/cover Primary source data are preferably IRS LISS-IV MX Data, Google Earth data, Topographic map sheet and if required any remote sensing data of higher resolution and/ or data from ISRO’s Bhuvan Portal. Essential Modified and corrected polygons on analog maps need to be digitised in a GIS along with relevant  attribute entries
    Geo-hydrology (Drainage) Primary source data are preferably IRS LISS-IV MX Data, ASTER DEM, Topographic map sheet etc. - Buffering would be done in a GIS after examining the spatial association with prevalent landslides.
Copyright 2017 © Geological Survey of India
Copyright 2017 © Geological Survey of India
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