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ANNEXURE-IA The CODIFICATION SCHEME ADOPTED FOR VARIOUS
THEMES
A. Base Map
a) Base Poly
River Name River Code
01
02
03
S.No. Field Name Field Type Width
1 River Name Character 30
2 River Code Character 02
b) Base Line
Line Name Line Code
Main route road under 01
All other road 02
Rail (if any) 03
Corridor boundary line 04
(ridge line /watershed boundary line
S. No. Field Name Field Type Width
1 Line Name Character 25
2 Line Code Character 02
c) Base Point
Point Name Point Code
Village Name 01
Spring 02
S. No. Field Name Field Type Width
1 Point Name Character 40
2 Point Code Character 02
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B. Lithological Map
Litho. Name Point Code
Shale 01
Siltstone 02
Sandstone 03
Limestone 04
Shale with sandstone / limestone / dolomite 05
Slate 06
Phyllite 07
Quartzite 08
Quartzite alternating with Shale/Slate /Phyllite 09
Quartzite alternating with Schist 10
Schist 11
Schist with Slate / Phyllite 12
Dolomite / marble 13
Granites 14
Gneiss 15
Basic / Metabasic / Ultra basic 16
Volcanics / Meta volcanics 17
Boulder conglomerate 18
Volcanics / Meta volcanics 19
Boulder conglomerate 20
Sandstone with Shale/ Siltstone 19
Unconsolidated Sediments / materials 20
S. No. Field Name Field Type Width
1 Litho. Name Character 40
2 Litho. Code Character 02
C. Rock Weathering Map
Weath. Name Weath. Code (ID)
Low 01
Moderate 02
High 03
Very High 04
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Nil 05
S. No. Field Name Field Type Width
1 Weath. Name Character 30
2 Weath. Code Character 02
B. Soil Map
a) Soil Texture
Soil Name Soil Code
Sandy skeletal soil 01
Loamy skeletal soil 02
Sandy soil 03
Silty soil 04
Clayey soil 05
Loamy soil 06
Rock outcrop 07
S. No. Field Name Field Type Width
1 Soil Name Character 30
2 Soil Code Character 02
b) Soil Depth
Depth Name Depth Code
0-25 cm (shallow) 01
25-50 cm (moderate) 02
50-100 cm (deep) 03
> 100 cm (very deep) 04
S. No. Field Name Field Type Width
1 Soil depth Name Character 30
2 Soil depth Code Character 02
E. Geomorphologic map
Geom. Name Geom. Poly-Code
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Low dissected denudo-structural hill 01
Moderately dissected denudo – structural 02
Hill 03
Highly dissected denudo – structural hill 04
Alluvial Fans 05
River Terraces 06
Flood plain 07
Valley 08
Toe removal / erosion /cutting (by river)
(If slope-dip relation is already shown in geomorphology, it
gets the following ID. Otherwise as an individual layer, separate
ID is given in slope-dip parameter code).
Dip Facets parallel to slope} Reference 01a
Dip Facets opposite to slope} to road 02a
S. No. Field Name Field Type Width
1 Geom. Name Character 30
2 Geom. Code Character 02
F. Slope map
Slope – Name Slope – Code
0-15 01
15-25 02
25-30 03
30-35 04
35-40 05
40-45 06
45-60 07
> 60 08
S. No. Field Name Field Type Width
1 Slope Name Character 10
2 Slope Code Character 02
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G. Slope Aspects Map
ASP. Name ASP- Code
North facing 01
South facing 02
NE facing 03
NW facing 04
SE facing 05
SW facing 06
East facing 07
West facing 08
Flat 09
S. No. Field Name Field Type Width
1 ASPECCT Name Character 20
2 ASPECT Code Character 02
H. Slope Morphology Map
SI.morph. name SI.Morph.Code
Convex 01
Concave 02
Straight 03
*Break in slope 04
*If break in slope is a line, it should be made as separate cover.
S. No. Field Name Field Type Width
1 Morph - Name Character 20
2 Morph - Code Character 02
I. Lineament Map
a) Lineament type
Lineament name Lineament – Code
Minor Lineament 01
Major Lineament 02
Mega Lineament 03
S. No. Field Name Field Type Width
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1 Lin - Name Character 25
2 Lin - Code Character 02
b) Density (Modeling Stage)
Den. Name Den. - Code
Very low 01
Low 02
Moderate 03
High 04
Very High 05
Nil 06
S. No. Field Name Field Type Width
1 Density Name Character 25
2 Density Code Character 02
c) Intersection (Modeling Stage)
Intersection name Int- Code
Very low 01
Low 02
Moderate 03
High 04
Very High 05
Nil 06
S. No. Field Name Field Type Width
1 Int Name Character 25
2 Int Code Character 02
J. Fault Map
a) Fault type
Fault name Fault – Code
Minor fault 01
Major fault 02
Mega fault 03
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Thrust 04
S. No. Field Name Field Type Width
1 Fault Name Character 25
2 Fault Code Character 02
b) Prox Fault (Modeling Stage)
Fault name Fault – Code
0-250m 01
250-500 m 02
500-750 m 03
> 750 m 04
S. No. Field Name Field Type Width
1 Prox Name Character 25/ 15
2 Prox Code Character 02
K. Land use map
Land use name Land- Code
Dense Vegetation (more than 40% 01
Canopy) Medium Vegetation (10 to 40 % canopy) 02
Degraded Vegetation (less than 10% canopy) 03
Scrub/ grass land 04
Forest blank 05
Barren land (rocky) 06
Barren land (non – rocky, wasteland) 07
Agricultural land 08
Built up area 09
River sand 10
Water body 11
Snow covered area 12
S. No. Field Name Field Type Width
1 Land use Name Character 25
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2 Land use Code Character 02
L. Anthropogenic factor map
Anthro. Name Anthro – Code
Road / slope cutting 01
Mining 02
Toe removal / erosion / cutting (by river) 03
(As it is a natural phenomenon, it should be shown in geomorphology).
S. No. Field Name Field Type Width
1 Anthro Name Character 15
2 Anthro Code Character 02
M. Landslide (Active & Old Landslide)
Landslide name Landslide – code
Active slide 01
Old slide 02
S. No. Field Name Field Type Width
1 Slide name Character 15
2 Slide code Character 02
Trunk streams (main river) were depicted as a single line passing through the center
as a requirement of digitization. The base details were generated in three different layers, viz.,
Base- poly, baseline and Base- point Roads were shown in Baseline layer, settlement was
shown in base-point layer and major river was shown in Base- poly layer in polygon feature
type. The lineaments and faults were classified as per length. All the sheets were edge
matched and in some of the themes the maps of entire area were generated and thereafter
clipped sheet- wise, in order to integrate the thematic maps of each individual map sheet for
generating Landslide Hazard Zonation ( LHZ) and Landslide Hazard Management (LHM)
maps.
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ANNEXURE-IB PARAMETERES AND THEIR CATEGORIES AND THEIR
RELATIVE RANKING IN TERMS OF THEIR INFLUUENCE TO LANDSLDES
RANK SCALE 1-10, 1- LEAST INFLUENCE, 10-HIGHEST INFLUENCE
Parameters Average Rank Category of
Parameters
Ranks
Rock Weathering 5.5 Low
Moderate
High
Very High
Very low to nil
2
5
8
10
1
Soil Texture 4.5 Sandy skeletal soil
Loamy skeletal soil
Sandy soil
Silty soil
Clayey soil
Loamy soil
Rock outcrop
1
2
2.5
7
10
4
1
Slope Aspects 4 North facing
South facing
NE facing
NW facing
SE facing
SW facing
East facing
West facing
1
10
3
2
6
4
5
2
Slope Morphology 3 Convex
Concave
Straight
Break in slope
7
4
2
9
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ANNEXURE-IC PARAMETERES AND THEIR CATEGORIES AND THEIR
RELATIVE RANKING IN TERMS OF THEIR INFLUUENCE TO LANDSLIES
RANK SCALE 1-10, 1- LEAST INFLUENCE, 10-HIGHEST INFLUENCE
Parameters Average Rank Category of
Parameters
Rank
Slope-Dip
(Bedding, joint)
Relation
9 Dip Facets parallel to
slope
Dip Facets opposite to
slope
10
1
Geomophology 8.5 Low dissected denudo-
structural hill
Moderately dissected
denudo-structural hill
Highly dissected
denudo-structural hill
Alluvial fans, uplifted
river terraces
River terraces
Flood plain
Valley
Toe
removal/erosion/cutting
(by river)
3
6
8.5
4
1
1
1
9
Density of
Lineaments
8 Absolute value of
numbers in considered in
1 km grid
Drainage Density 7.5 Very low
Low
Moderate
High
Very high
Nil
2
3
6
8
10
1
Intersection of 7.2 Absolute value of
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Lineament numbers in considered in
1 km grid
Landuse 7 Dense vegetation (>40%
canopy cover)
Medium vegetation (10-
40% canopy cover)
Degraded vegetation
(<10% canopy cover)
Scrub land/grass land
Forest blank
Barren land (rocky)
Barren land (non rocky)
Agricultural land
Built-up land
River sand
Snow covered area
1
4
7
6
7.5
8
9
2
3
1
5
Soil Depth 6 0-25 cm (shallow)
25-50 cm (moderate)
50-100 cm (deep)
>100 cm (very deep)
2
3
5
7
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ANNEXURE IIA –FINAL WEIGHTS FOR DATA INTEGRATION DERIVED FROM
PAIR WISE COMPARISON
Parameters Weight Category Weight
Alluvial fans, uplifted
river terraces
River terraces
Flood plain
Valley
Toe
removal/erosion/cutting
(by river)
18.25
4.17
4.17
4.28
100
Density of
Lineaments
47.04 *
Drainage Density 37.93 **
Intersection of
Lineament
32.12 *
Landuse 25.24 Dense vegetation
(>40% canopy cover)
Medium vegetation
(10-40% canopy cover)
Degraded vegetation
(<10% canopy cover)
Scrub land/grass land
Forest blank
Barren land (rocky)
Barren land (non rocky)
Agricultural land
Built-up land
River sand
Snow covered area
5.87
16.33
45.88
33.16
52.11
70.11
100
8.15
11.50
5.87
22.95
Soil Depth 18.79 0-25 cm (shallow)
25-50 cm (moderate)
50-100 cm (deep)
>100 cm (very deep)
10.48
34.27
72.87
100
Rock Weathering 17.41 Low 13.48
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Moderate
High
Very High
Very low to nil
41.25
66.59
100
6.69
Soil Texture 12.08 Sandy skeletal soil
Loamy skeletal soil
Sandy soil
Silty soil
Clayey soil
Loamy soil
Rock outcrop
8.51
12.37
15.13
76.19
100
35.22
8.51
Slope Aspect 11.23 North facing
South facing
NE facing
NW facing
SE facing
SW facing
East facing
West facing
6.36
100
14.24
9.15
60.57
21.64
31.04
9.15
Slope Morphology 6.32 Convex
Concave
Straight
Break in slope
58.24
31.85
9.97
100
* Lineaments are mapped as a line feature and are subjected to density analysis.
Densities computations are done on a 1km x 1km grid both based on length of
lineaments are number of lineament for Mega, Major, Minor lineaments and are
integrated to form lineament density layer. Mega (length greater than 1500 m), major
(length 500-1500 m) and minor (0-500 m) lineaments are taking a weightage of 50,30
and 20 respectively. A weightage of 40 was given to lineament density based on
length and a weightage of 60 was given to lineament density based on number.
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Influence of mega lineament in handle by considering a buffer of 100 m around it like
major fault.
Similarly intersections of lineaments in 1 km X 1 Km are counted to generate
intersection of lineament layer.
** Drainage network is subjected to density analysis. Density computations are
done 500 m X 500 m grid, both based on length and number of drainage lines and are
integrated to from drainage density layer, with a weightage of 40 for length based
drainage density and a weightage of 60 for number based drainage density.
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RANK SCALE 1-10, 1- LEAST INFLUENCE, 10-HIGHEST INFLUENCE
Parameters Average
Rank
Category of Parameters Ranks
Proximity to Fault 10 Length Buffer
distance
on either side
Minor fault 0-500m 50m
Major fault 500-1500m 100m
Mega fault >1500m 150m
Thrust 200m
4
6
8
10
Slope 9.5 0-15
15-25
25-30
30-35
35-40
40-45
45-60
>60
1
2
6
7
9
9.5
8
7.5
Lithology 9.3 Shale
Siltstone
Sandstone
Limestone
Shale with Sand
Stone/Limestone/Dolomite
Slate
Phyllite
Quartzite
Quartzite alternating with
Shale/Slate/Phyllite
Quartzite alternating with Schist
Schist
Schist with Slate/Phyllite
Dolomite/marble
Granties
7
6
4
3
8
7
7
1
6
6
7
8
2
2
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Gneiss
Basic/Metabasic/Ultrabasic
Volcanics/Meta volcanics
Boulder conglomerate/Semi-
consolidated sediments
Sandstone with shale/siltstone
Unconsolidated Sediments/Materials
2
3
3
9
7
10
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ANNEXURE-IIB: FINAL WEIGHTS FOR DATA INTEGRATION DERIVED
FROM PAIR WISE COMPARISON
Parameters Weight Category Weight
Proximity to Fault 100 Length Buffer distance
23.47
48.62
70.58
100
Minor fault 0-500m 50m
Major fault 500-1500m 100m
Mega fault >1500m 150m
Thrust 200m
Slope 91.15 0-15
15-25
25-30
30-35
35-40
40-45
45-60
>60
6.58
8.64
25.18
39.27
83.94
100
61.94
47.79
Lithology 84.63 Unconsolidated Sediments/Materials
Boulder conglomerate/Semi-consolidated
sediments
Shale with Sand stone/Limestone/Dolomite;
Schist with Slate/Phyllite
Shale; Slate; Phyllite; Schist; Sandstone with
shale/siltstone
Siltstone; quartzite alternating with
Shale/Slate/Phyllite; quartzite alternating with
Schist
Sandstone
Limestone; basic/metabasic/ultrabasic;
volcanic/ meta volcanics
Dolomite/marble; granites; gneiss
Quartzite
100
85.91
64.81
58.58
21.09
14.91
10.54
7.59
5.74
Slope-Dip
(Bedding, joint)
Relation
72.96 Dip facets parallel to slope
Dip facets opposite to slope
100
0
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Geomorphology 61.73 Low dissected denudo structural hill
Moderately dissected denudo structural hill
Highly dissected denudo structural hill
23.44
43.16
78.98
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ANNEXURE-III: LANDSLIDE MANAGEMENT RULES
PARAMETERS SUGGESTED MANAGEMENT
PRACTICES
Dense Vegetation Forest conservation and channelisation
Medium Vegetation Afforestation, forest conservation and
channelisation
Degraded Vegetation/Forest Blank with
25-450 slope and softer rocks
Slope modification and afforestation
Degraded Vegetation/Forest Blank with
25-450 slope and harder rocks
Afforestation and channelisation
Degraded Vegetation/Forest blank with
softer and harder rocks having slope less
than 250 and more than 45
0
Bio-technical measures
Scrub/Grassland with 25-450 slope and
softer rocks
Slope-modification, bio-technical
measures, controlled grazing and grassland
development
Scrub/Grassland with 25-450 slope and
harder rocks
Bio-technical measures and controlled
grazing
Scrub/Grassland with softer and harder
rocks, slope less than 250 and more than
450
Grassland development and channelisation
Barren land rocky with softer rocks
between 25-450 slope
Slope modification, terrace cultivation and
grassland development
Barren land rocky with harder rocks
between 25-450 slope
Retention wall with drain holes and bio-
technical measures
Barren land rocky (both harder and softer
rocks) and slope below 250 and above 45
0
Channelisation and bio-technical measures
Agricultural land Soil conservation
River Sand; Snow covered area; built up
areas falling in moderate hazard zone;
mining; all low and very low hazard zones
Planned developmental activity
Active Slides and Barren land non-rocky
(25-450 slope)
Retention wall with drain boles,
channelisation, slope modification and bio-
technical measures
Barren land non-rocky with slope less than Channelisation and bio-technical measures
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250 and more than 45
0
Road/Slope cutting Retention wall with slope modification
along the Buffer zone (25m each side)
Slope-Bedding Dip parallel towards the
road
Retention wall with drain holes and
channel diversion, anchoring and bolting
Toe removal River training
Built up area in high, very high and severe
hazards in softer rocks and 25-450
slope
Slope modifications as required and avoid
further constructional activity
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ANNEXURE- IV IRS-1B, LISS-II geocoded FCC data of 14.10.1991(A) and IRS-1D,
LISS-III geocoded FCC data 10.10.1999 (B) covering sheet No. 62B/8
respectively
(A) (B)
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ANNEXURE-V IRS-1D, LISS-III geocoded FCC data of 10.10.1999(A) and IRS-1D,
LISS-III geocoded FCC data 10.10.1999(B) covering sheet No. 62B/12 and 62B/16
respectively
(A) (B)
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