landslide mapping & modeling (use of gis...
TRANSCRIPT
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Dr. Pankaj Jaiswal
Geological Survey of India
Esri India Regional User Conference (East), Kolkata on June 15, 2017
Landslide Mapping & Modeling
(use of GIS technology)
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What are landslides?
… the movement of a mass of rock, debris or
earth down a slope due to the action of gravity
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Mapping susceptible slopes
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Distribution of toposheets
~ 0.42 million km2 (12.6%)
National Landslide Susceptibility Mapping
(NLSM) Project
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Seamless thematic maps on 1:50k
Landslide inventory repository
Landslide susceptibility maps
to generate…
target: 2020
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Seamless landslide susceptibility maps
Detailed landslide inventory
Thematic maps
LULC
GEOM
SFM
etc…
deliverables…
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90 officers with GIS
knowledge in NLSM
Interactive Orientation
Programmes
Brain-storming sessions
Specialised Training
Module
GIS application
NLSM initiation: 2014
Planning & initiation…
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Thematic maps data source
1. Slope, Aspect and Curvature Map : Aster DEM of 30m
2. Drainage : Aster DEM of 30m (auto generated)
3. Distance to structures : GSI’s Geology (1:50k),
Aster DEM of 30m
4. Slope Forming Material : mainly field based
5. Land use/cover : LISS III/IV, Google, Toposheet
6. Regolith Depth : mainly field based
7. Geomorphology : NGLM data, Google, Toposheet
8. Landslide Inventory : LISS III/IV, Google, Toposheet
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limitation
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Basemap in ArcGIS 10.2
Landslide mapping…
LISS IV
CartosatGIS facilitates mapping
using multiple sources of
varying resolution
Toposheet
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limitation
10
More than 10,000
landslides mapped
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limitation
Thematic maps…
19000
km2
area
mapped
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Methodology…
Data
integration in
GIS
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Methodology…..Yule’s Coefficient
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limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Clipping with boundary
Polygon to Raster
Adding of Field
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limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Getting summary statistics Adding to Field
(T)
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limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Using Combine Function for
combining landslide with
thematic class
Adding to Field
(T11)
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limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Joining with raster map Adding to Field
Getting summary statistics
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limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Generating Attribute map
using Lookup FunctionNaming output as LOFS map
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limitation
GIS application…
Step-4: integration of LOFS maps
Integrating LOFS maps
using Map Algebra
Function
Success rate curve generated in ILWIS
using ‘script’
Legend
SuscScore
ValueHigh : 0.945456
Low : 0
Classified
Susceptibility
Map
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Conclusions…
GIS technology is very useful in landslide studies
Modeling for LSM for UK takes ‘one hour’
Saves time
Enhances output – quality & presentation
35 IGC, Cape Town, 27 August – 4 September 2016
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limitation
Uploading in GSI web for Pubic viewing
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