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1
INTRODUCTION 
 Landslide is the movement of earth, mass of rock or debris 
along the slope 
 Gharwal Himalaya is a part ...
INTRODUCTION 
 Landslides may be ignored if they occur in the area of 
no human interest 
 But if it occur in areas like...
INTRODUCTION 
 There is need to study and classify the Himalayan 
landslides from road network point of view in 
Mountain...
STUDY AREA 
 3 areas have been selected 
a ) Gopeshwar city of Chamoli district 
b ) Stretch of Chamoli-Joshimath road ne...
6
GEOLOGY OF AREA 
 There is an intense metamorphosis in area 
 Land consist of rocks such as quartzite, gneisses, 
marble...
LANDSLIDE 
 Geography and Geology of this area makes it prone to 
landslides 
 Besides this area comes under zone IV of ...
LANDSLIDES 
Following types of landslide was observed in study area 
1. Slides 
2. Falls 
3. Flow 
4. Topples 
9
ROCKFALL 
10
TOPPLES 
11
SLIDE 
12
FLOW 
13
RS AND GIS TECHNIQUE 
 Field survey is most accurate way to study landslides 
 But to study large and remote area it is ...
REMOTE SENSING (RS) 
 RS data like satellite images and aerial photographs are 
used to extract terrain information. 
 S...
GEOGRAPHICAL INFORMATION 
SYSTEM (GIS) 
 GIS has information about different terrain factors in 
the form of layers 
 Wi...
ILWIS 
 ILWIS (Integrated Land and Water Information 
System) is a GIS software developed by ITC, 
Netherland. 
 It cont...
Landslide hazard zonation mapping 
 There is no basis available to forecast the probability of 
landslide occurrence in g...
Landslide hazard zonation mapping 
Following data used to measure landslide hazard of an 
area: 
 Past landslides and the...
Applications of hazard zonation 
 It helps to decide land use capability of area 
 It shows risk to current land use dev...
METHODOLOGY 
 Remote sensing and GIS are two main methodologies 
adopted for landslide hazard zonation 
 Remote sensing ...
RS DATA INTERPRETATION 
 Digital data of IKONOS is procured from 
www.earth.google.comof all study areas. 
 The color co...
23
GENERATION OF DIGITAL ELEVATED 
MODEL (DEM) 
 Base map is imported to ILWIS and converted to 
ILWIS data format 
 Geo co...
GENERATION OF DIGITAL ELEVATED 
MODEL (DEM) 
 DEM is prepared after interpolating the contour 
segment data 
 DEM is ana...
26
27
Generation of hazard zonation map 
 Satellite data was imported and geo referenced with 
base map 
 The data is then int...
29
30
Preparing stereo pairs 
 From DEM stereo pairs are prepared to view for 
various rasters like slope degree map, satellite...
32
CONCLUSION 
 Landslides are Force Majeure. 
 When occurred, landslides causes great losses to both 
Human and Infrastruc...
34 
THANK YOU!!!
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LANDSLIDE HAZARD ZONATION MAPPING USING RS AND GIS

Its about landslide hazard zonation of remote areas using RS and GIS techniques. These techniques are accurate and time saving tools.

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LANDSLIDE HAZARD ZONATION MAPPING USING RS AND GIS

  1. 1. 1
  2. 2. INTRODUCTION  Landslide is the movement of earth, mass of rock or debris along the slope  Gharwal Himalaya is a part of extra peninsula  Structural disturbances like folding, faulting, and shearing are very common in this region  This area exhibits variety of landslides because of various natural as well as artificial activities 2
  3. 3. INTRODUCTION  Landslides may be ignored if they occur in the area of no human interest  But if it occur in areas like roads, agricultural lands, human inhabited areas then it leads to loss of life and property  Minor to major landslides that are very common near Pipalkoti area on the road of Chamoli to Joshimath that have increased the maintenance cost of Rishikesh –Mana Highway 3
  4. 4. INTRODUCTION  There is need to study and classify the Himalayan landslides from road network point of view in Mountain terrain  This study is done by available Base maps of area and their interpolation with RS and GIS to form the landslide hazard zonation maps of respective study areas 4
  5. 5. STUDY AREA  3 areas have been selected a ) Gopeshwar city of Chamoli district b ) Stretch of Chamoli-Joshimath road near Pipalkoti c ) Area around Nandprayag  Area lies in Survey of India toposheet covering 26.18 sq.km, 21 sq.km and 17.63 sq.km respectively 5
  6. 6. 6
  7. 7. GEOLOGY OF AREA  There is an intense metamorphosis in area  Land consist of rocks such as quartzite, gneisses, marbles and various types of micaceous schist and slates  All these rocks have weak cohesion along the plains  Physiographically the area lies in tectonic , folded and over thrust mountainous chain. 7
  8. 8. LANDSLIDE  Geography and Geology of this area makes it prone to landslides  Besides this area comes under zone IV of earthquake  High flow of rivers and ice melting triggers the action of landslides  Besides this road development across slopes and deforestation adds effect to landslide. 8
  9. 9. LANDSLIDES Following types of landslide was observed in study area 1. Slides 2. Falls 3. Flow 4. Topples 9
  10. 10. ROCKFALL 10
  11. 11. TOPPLES 11
  12. 12. SLIDE 12
  13. 13. FLOW 13
  14. 14. RS AND GIS TECHNIQUE  Field survey is most accurate way to study landslides  But to study large and remote area it is consuming time and money  RS and GIS are most effective tools in such condition to obtain results with good accuracy  Various satellite images provided by IKONOS, IRS P6, QUICK BIRD etc can be used as base to study landslides. 14
  15. 15. REMOTE SENSING (RS)  RS data like satellite images and aerial photographs are used to extract terrain information.  Satellite data of different years gives information about changes in geomorphology of area.  Various factor maps like land use map, drainage map etc can be prepared from processing of RS data 15
  16. 16. GEOGRAPHICAL INFORMATION SYSTEM (GIS)  GIS has information about different terrain factors in the form of layers  With use of GIS software like ILWIS it is possible to combine the factor map produced by RS with landslide map.  This will visualize landslide density in survey area . 16
  17. 17. ILWIS  ILWIS (Integrated Land and Water Information System) is a GIS software developed by ITC, Netherland.  It contains both the modules of GIS and image processing  It is very fast and accurate tool for processing, analyzing and representing spatial data.  It is a useful tool for landslide analysis 17
  18. 18. Landslide hazard zonation mapping  There is no basis available to forecast the probability of landslide occurrence in given time period  But landslide hazard assessment is possible  Hazard assessment is the estimation of an area to its susceptibility to landslide based on few key factors 18
  19. 19. Landslide hazard zonation mapping Following data used to measure landslide hazard of an area:  Past landslides and their distribution  Bed rock properties  Slope of area  Hydrology of area  Human factors 19
  20. 20. Applications of hazard zonation  It helps to decide land use capability of area  It shows risk to current land use development  It shows area vulnerable to landslide  Based on surveys it helps to predict future landslides 20
  21. 21. METHODOLOGY  Remote sensing and GIS are two main methodologies adopted for landslide hazard zonation  Remote sensing data used in the form of satellite imageries  GIS software is used to interpolate both satellite data and base maps to form hazard zonation map 21
  22. 22. RS DATA INTERPRETATION  Digital data of IKONOS is procured from www.earth.google.comof all study areas.  The color composite is prepared in ILWIS in RGB bands.  The satellite data is geo-referenced and rectified with base map of study area.  Base map is prepared by use of toposheets. 22
  23. 23. 23
  24. 24. GENERATION OF DIGITAL ELEVATED MODEL (DEM)  Base map is imported to ILWIS and converted to ILWIS data format  Geo coding and Geo referencing is done to generate a raster (Images in Geo-Informatics)  The segment maps are digitized in respective domain boundaries of area, contours and drainage. 24
  25. 25. GENERATION OF DIGITAL ELEVATED MODEL (DEM)  DEM is prepared after interpolating the contour segment data  DEM is analyzed by spatial filtering and slope maps are derived  From DEM flow direction and flow accumulation map is also prepared  Degree of map was classified as per Young's Classification 25
  26. 26. 26
  27. 27. 27
  28. 28. Generation of hazard zonation map  Satellite data was imported and geo referenced with base map  The data is then interpreted by image interpretation keys and pre occurred landslides and landslide hazard zones are located  The slope map layer, flow map layer, drainage layer are added on RS data to predict the landslide prone zones 28
  29. 29. 29
  30. 30. 30
  31. 31. Preparing stereo pairs  From DEM stereo pairs are prepared to view for various rasters like slope degree map, satellite data etc  The generated stereo pairs are viewed as ANAGLYPH. 31
  32. 32. 32
  33. 33. CONCLUSION  Landslides are Force Majeure.  When occurred, landslides causes great losses to both Human and Infrastructure.  Remote Sensing data has proved to be an effective tool for landslides study in remote areas like Himalayan ranges.  RS and GIS based Hazard Zonation Maps gives accurate information about the Risk levels in a particular area.  GIS techniques found to be very economical for field study in inaccessible areas. 33
  34. 34. 34 THANK YOU!!!

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Its about landslide hazard zonation of remote areas using RS and GIS techniques. These techniques are accurate and time saving tools.

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