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Essential fisheries habitatEssential fisheries habitat
classification in the Lowerclassification in the Lower SongkhramSongkhram
River BasinRiver Basin using Remote Sensing andusing Remote Sensing andGIS techniquesGIS techniques
SeksanSeksan DuangsriDuangsri
UbolratanaUbolratana SuntornratanaSuntornratana
ThihaThihaAnupongAnupong SanitchonSanitchon
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1.Introduction1.Introduction Songkhram River Basin are a famous for fisheriesSongkhram River Basin are a famous for fisheries
production.production.
Department of Fisheries and MRC conduct the riverDepartment of Fisheries and MRC conduct the rivermanagement .management .
Remote sensing can be defined as the scienceRemote sensing can be defined as the sciencetechnology and art of obtaining information abouttechnology and art of obtaining information aboutobjects from a distance.objects from a distance.
Remote sensing help fisheries study throughRemote sensing help fisheries study throughinvestigating spatial distribution of habitats importantinvestigating spatial distribution of habitats important
for fisheries production and management in integrationfor fisheries production and management in integrationwith GIS technology.with GIS technology.
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The Lower Songkhram River Basin
Area StudyThe lower Songkhram River Basin inthe northeastern of Thailand.
Cutting area come from Landsat imageof WRS path 127 and row 48
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2. Objectives2. Objectives
Supporting the Songkhram River FisheriesSupporting the Songkhram River Fisheries
managementmanagement ProgrammeProgramme
Using remote sensing images classifyUsing remote sensing images classify
habitats mappinghabitats mapping
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3.Methodology3.Methodology3.1 Data sources3.1 Data sources
DownloadDownload LandsatLandsat ETM+ images of WRS fromETM+ images of WRS fromMichigan State University atMichigan State University at www.landsat.orgwww.landsat.org
18 March 2003 (dry season)18 March 2003 (dry season)
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Download from Global Land Cover Facility atDownload from Global Land Cover Facility at
http://glcfapp.umiacs.umd.edu:8080/esdi/http://glcfapp.umiacs.umd.edu:8080/esdi/
17 September 2000 (wet season)17 September 2000 (wet season)
6 November 1992 (master image)6 November 1992 (master image)
MethodologyMethodology
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MethodologyMethodology
Geo-referencing
Master6Nov1992
Co-registration
software
ERDAS
Wet/dryimages
Wet/dryimages
Wet/dry
images
Topo-map
scale 1:50,000
software
ENVI
Subset transformed images
Each geo-referencing used at least 20
ground control points and resulted in a
total RMSE of less than half a pixel (15
meters)
Wet/dryimages
Transform UTM
3.2 Image Pre-processing
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Remote sensing data
30x30 m28-Sep-04**Landsat 7, ETM+
30x30 m6-Nov-92*Landsat 5, TM13.2 m30x30 m18-Mar-03Landsat 7, ETM +
12.8 m30x30 m17-Sep-00Landsat 7, ETM +
RMSR
(Root Mean Square Error)
Ground
resolution
Acquisition
date
Satellite and sensor
* = Master image used for image-coregistration of all ETM+ images
** = Scan Line Corrector (SLC) off image
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3.3 Habitat type classification
A self-developed habitat classification that was based on field
observations and researchers familiarity with the area
Reference materials: topographic maps (scale 1:50,000) and
Landsat images
Image subsets of Lower Songkram River basin were classified
into ten habitats.
Survey for ground truthing
using : GPS Garmin 60
time : July-August 2006
MethodologyMethodology
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Topographic map for GroundTopographic map for Ground truthingtruthing waypointwaypoint
scale 1:50,000Ground truthing Waypoint
July 2006 25 waypoints
August 2006 27 waypoints
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3.4 Processing (Image classification)
Using software ERDAS , ArcView
Both thematic maps produced simple statisticanalysis of area of each habitat type.
Wet/dry
images
Subset transformed images
From Geo-referencing
Data set ground truthing
ERDAS ArcView
Thematic map
MethodologyMethodology
Inundated flood map
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4.Outputs4.Outputs
Total 10 different habitatsTotal 10 different habitats Two habitat maps showing major habitats for
fisheries
Inundated Flood Thematic mapInundated Flood Thematic map
Area statistics for each habitat
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Permanent water bodies(main rivers and streams)
Permanent water body (Non-channel type)
Habitats
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Riparian mixed vegetation
Barren land
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Mixed vegetation Inundated flood
Paddy rice flied
Settlement
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Wet and dry season habitats in Lower Songkhram River basin
Wet seasonDry season
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DryDry -- Wet seasonWet season
Inundated Flood Thematic mapInundated Flood Thematic map
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Habitat Area (ha) Percentage Area (ha) Percentage
Permanent water body (river and stream) 5,990 1.71 2,037 0.58
Permanent water body (non-channel type) 11,262 3.22 11,406 3.25
Inundated floods 53,486 15.28 - 0.00
other habitats 279,411 79.79 337,117 96.17
total 350,148 100.00 350,560 100.00
Wet season Dry season
Area statistics for each habitat thematic map
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5.Problem and limitation5.Problem and limitation Low spatial resolutionLow spatial resolution
Cloud cover in some areaCloud cover in some area
Image of September 2004 was not goodImage of September 2004 was not good
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6.Recommendation6.Recommendation
The classified habitat maps are subject to accuracyThe classified habitat maps are subject to accuracyassessment to evaluate the correctness of eachassessment to evaluate the correctness of each
habitat.habitat.
Ground truth data are necessary for classify habitats.Ground truth data are necessary for classify habitats.
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