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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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)
2
What are landslides?
… the movement of a mass of rock, debris or
earth down a slope due to the action of gravity
3
Mapping susceptible slopes
4
Distribution of toposheets
~ 0.42 million km2 (12.6%)
National Landslide Susceptibility Mapping
(NLSM) Project
5
Seamless thematic maps on 1:50k
Landslide inventory repository
Landslide susceptibility maps
to generate…
target: 2020
6
Seamless landslide susceptibility maps
Detailed landslide inventory
Thematic maps
LULC
GEOM
SFM
etc…
deliverables…
7
90 officers with GIS
knowledge in NLSM
Interactive Orientation
Programmes
Brain-storming sessions
Specialised Training
Module
GIS application
NLSM initiation: 2014
Planning & initiation…
8
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
limitation
9
Basemap in ArcGIS 10.2
Landslide mapping…
LISS IV
CartosatGIS facilitates mapping
using multiple sources of
varying resolution
Toposheet
limitation
10
More than 10,000
landslides mapped
limitation
Thematic maps…
19000
km2
area
mapped
12
Methodology…
Data
integration in
GIS
13
Methodology…..Yule’s Coefficient
limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Clipping with boundary
Polygon to Raster
Adding of Field
limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Getting summary statistics Adding to Field
(T)
limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Using Combine Function for
combining landslide with
thematic class
Adding to Field
(T11)
limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Joining with raster map Adding to Field
Getting summary statistics
limitation
GIS application… ModelBuilder
Step-3: spatial analysis
Generating Attribute map
using Lookup FunctionNaming output as LOFS map
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
20
21
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
limitation
Uploading in GSI web for Pubic viewing
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