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Application of GIS and Remote sensing technique to assess

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1 Application of GIS and Remote sensing technique to assess
the status of forest types of the Southern Eastern Ghats, India G.Areendran WWF-India Society for conservation GIS 10th Annual International Conference,Monterey,California,2007.

2 Extend of Eastern Ghats
The Eastern Ghats form a broken chain of mountainous terrain spreading in the states of Orissa, Tamil Nadu, Andhra Pradesh and two districts of Karnataka. Location- 11 ° 30 ‘ - 22° N latitude and 76 ° 50 ‘ - 86 ° 30 E longitude. Area 75,000 sq.kms of forested area with an average width of about km. Maximum Altitude recorded at 1762 metres.Average elevation is 750 metres.

3 STUDY AREA The present study area is located between 7831’E- 8016'9"E and 1451'N –1055N Assemblage of discontinuous hill ranges, plateaus and escarpments. The entire Eastern Ghats constitutes major water sheds of many big rivers. The scope of the present study is restricted to stretches of the middle eastern Ghats and the southern eastern ghats mountains

4 Topography & Climate Geologically the Eastern Ghats present a rocky landscape, with quartzite rocks Average temperatures range from ° C and can go upto 45 °C during the summer months ( April –June) Mean annual rainfall ranges from cms exhibiting a semi arid climate

5 To study land use patterns in and around the natural forest patches.
Objective of the study To prepare various thematic maps of the study area using Geographic Information techniques Map the existing vegetation of the region with a focus on forest community, using remote sensing techniques To study land use patterns in and around the natural forest patches. To detect changes in the forest cover.

6

7 Methodology GIS Analysis Scanning Toposheets, Paper maps
Digitization of layers Administrative boundaries (Districts,taluk) Transport network, (Rail, Roads) Drainage,waterbodies, Contours (DEM, Slope, Aspects) Settlement locations, (Towns,villages) Global positioning system data Software used- Arcview 3.3, Arc-info ArcGIS9.1

8 Methodology Remote sensing analysis Data used
Land sat TM,(1990) Indian Remote sensing satellite LISS III, (2003) Techniques Image enchancement Radiometric correction Georeferencing Supervised classification Un-supervised classification Masking Accuracy assessment Forest cover change detection Software used- Erdas imagine 8.7

9 Methodology Field survey Reconnaissance survey
Pre-classification ground verification of various class based on the un-supervised classification GPS reading for different signature/class Post-classification ground verification for various vegetation and land use class Collection of photographic evidence for various vegetation classes

10 Results Broadly the vegetation types of Eastern ghats are
Tropical evergreen forests Tropical dry deciduous forests Southern Mixed dry deciduous forests Scrub forests Tropical dry evergreen forests

11 Results Land use/Land cover Area in sq.kms Percentage
Dry Evergreen Forest Dry Deciduous Forest Mixed Dry Deciduous Forest Thorn Forest Scrub Water Bodies Sandy Bed Open/Barren/Rocky Exposure/Cloud Plantation Waste Land Settlement Salt Pan Shadow Mangrove Agriculture Fallow Land Total Area in sq.kms Percentage 1.61 9.72 12.03 7.23 9.12 1.48 705.83 0.46 12.72 543.13 0.35 1.16 801.71 0.52 22.14 0.01 104.42 0.07 63.80 0.04 28.20 15.21 100

12 Forest cover of TamilNadu
Area in Sqkm Dry evergreen-1318 Dry deciduous-12069 Mixed dry deciduous-13553 Thorn forest-6198

13 Forest cover of Andhra Pradesh
Area in Sqkm Dry evergreen-1164 Dry deciduous-2898 Mixed dry deciduous-4961 Thorn forest-4932

14 Forest cover of Southern eastern ghats
Area in Sqkm Dry evergreen-2482 Dry deciduous-14967 Mixed dry deciduous-18514 Thorn forest-11130

15 Forest cover change detection map
Forest cover loss Area in Sqkm Dry evergreen-384 Dry deciduous-538 Mixed dry deciduous-1374 Thorn forest-587

16 Andhra Pradesh forest cover change
Area in Sqkm Dry evergreen-986 Dry deciduous-2620 Mixed dry deciduous4230- Thorn forest-4811

17 Tamil Nadu forest cover change
Area in Sqkm Dry evergreen-1112 Dry deciduous-11809 Mixed dry deciduous-12910 Thorn forest-5732

18 Percentage of forest loss

19 Thematic layers

20 Thematic layers

21 Thematic layers

22 Conclusions Increasing forest loss and habitat fragmentation is serious threat to biodiversity of the landscape. Native population of several flora and fauna is declining due to habitat degradation Detailed mapping of the fragmented forest patch is required to understand their nature Important corridors for mammals such as the Tiger and Elephant are highly threatened. Using satellite-based tools, regular monitoring of forest cover is suggested, which can provide valuable inputs for decision makers.

23 Dry Deciduous

24 Mixed dry deciduous

25 Thorn forest

26 Tamil Nadu Forest Department Andhra Pradesh Forest Department
Acknowledgement Tamil Nadu Forest Department Andhra Pradesh Forest Department Public Affairs office, U.S. Embassy, New Delhi Worldwide Fund For Nature-India Society For Conservation GIS Environmental System Research Institute


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