Presentation on theme: "Application of GIS and Remote sensing technique to assess"— Presentation transcript:
1 Application of GIS and Remote sensing technique to assess the status of forest types of the Southern Eastern Ghats, IndiaG.AreendranWWF-IndiaSociety for conservation GIS10th 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 AREAThe present study area is located between 7831’E- 8016'9"E and 1451'N –1055NAssemblage 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 & ClimateGeologically the Eastern Ghats present a rocky landscape, with quartzite rocksAverage 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 studyTo prepare various thematic maps of the study area using Geographic Information techniquesMap the existing vegetation of the region with a focus on forest community, using remote sensing techniquesTo study land use patterns in and around the natural forest patches.To detect changes in the forest cover.
7 Methodology GIS Analysis Scanning Toposheets, Paper maps Digitization of layersAdministrative boundaries (Districts,taluk)Transport network, (Rail, Roads)Drainage,waterbodies,Contours (DEM, Slope, Aspects)Settlement locations, (Towns,villages)Global positioning system dataSoftware 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)TechniquesImage enchancementRadiometric correctionGeoreferencingSupervised classificationUn-supervised classificationMaskingAccuracy assessmentForest cover change detectionSoftware used- Erdas imagine 8.7
9 Methodology Field survey Reconnaissance survey Pre-classification ground verification of various class based on the un-supervised classificationGPS reading for different signature/classPost-classification ground verification for various vegetation and land use classCollection of photographic evidence for various vegetation classes
10 Results Broadly the vegetation types of Eastern ghats are Tropical evergreen forestsTropical dry deciduous forestsSouthern Mixed dry deciduous forestsScrub forestsTropical dry evergreen forests
11 Results Land use/Land cover Area in sq.kms Percentage Dry Evergreen ForestDry Deciduous ForestMixed Dry Deciduous ForestThorn ForestScrubWater BodiesSandy BedOpen/Barren/Rocky Exposure/CloudPlantationWaste LandSettlementSalt PanShadowMangroveAgricultureFallow LandTotalArea in sq.kmsPercentage1.619.7212.037.239.121.48705.830.4612.72543.130.351.16801.710.5222.140.01104.420.0763.800.0428.2015.21100
12 Forest cover of TamilNadu Area in SqkmDry evergreen-1318Dry deciduous-12069Mixed dry deciduous-13553Thorn forest-6198
13 Forest cover of Andhra Pradesh Area in SqkmDry evergreen-1164Dry deciduous-2898Mixed dry deciduous-4961Thorn forest-4932
14 Forest cover of Southern eastern ghats Area in SqkmDry evergreen-2482Dry deciduous-14967Mixed dry deciduous-18514Thorn forest-11130
22 ConclusionsIncreasing 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 degradationDetailed mapping of the fragmented forest patch is required to understand their natureImportant 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.
26 Tamil Nadu Forest Department Andhra Pradesh Forest Department AcknowledgementTamil Nadu Forest DepartmentAndhra Pradesh Forest DepartmentPublic Affairs office, U.S. Embassy, New DelhiWorldwide Fund For Nature-IndiaSociety For Conservation GISEnvironmental System Research Institute