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Landslide zonation for hill area development
- Criterion Table
| THEME |
RANK1 |
RANK2 |
RANK3 |
RANK4 |
| (4 * weight) |
(3*weight) |
(2*weight) |
(1*weight) |
| Landuse |
Grass land, Agriculture |
Tea, Tea+Tree |
Forest |
Settlement |
| Soil |
KG4, KG5 |
KG3, KG6 |
KG2, KG7, KG8 |
KG1, KG9 |
| Slope |
36-54 deg |
18-36 deg |
> 54 deg |
0-18 deg |
- Landslide Hazard Zonation Mapping
Using union command, Landslide hazard zonation map was prepared by integrating the effect of various triggering factors. The zonation map divides the study area into four zones of landslide vulnerability viz., very high, high, moderate and poor.
Thus, the landslide prone areas having 4 zones were obtained as shown in figure-6.
Conclusion
Remote sensing and GIS techniques play a significant role in landslide zonation mapping. Landslide identification, which is a crucial parameter for any regional landslide hazard assessment, can be very well done particularly with aerial photographs. Coupled with aerial photos, GIS is an excellent tool to display the spatial distribution of landslides along with their attributes. However, the landslide map so prepared should be validated with ground checks.
Acknowledgement
Authors are grateful to the Director, IRS for his kind permission to publish the work.
References:
- "The Nilgiri Landslides" - Geological Survey of India - Publication no: 57, 1982.
- Quido Zaruba and Vojtech Mencl - "Landslides and their control" Czechoslovakia, 1982.
- Paul R.Wolf, - "Elements of Photogrammetry" McGraw-hill Inc. New York, 1983.
- Lillesand, J.M and Kiefer, R.W., - "Remote Sensing and Image Interpretation",
- P.A.Burrough - " Principles of Geographical Information Systems"
- Mohanadoss and Sunitha - "landslide hazard zonation map of Marappalam using
Remote sensing technique and GIS",Anna University, Chennai-25.
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