Meghalaya - Ministry of Environment and Forests

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6.0 ACCURACY ASSESSMENTA comprehensive accuracy assessment protocol has been followed for determining the quality of informationderived from remotely sensed data. Accuracy assessment involves determination of thematic (classification)as well as locational accuracy. In addition, GIS database(s) contents have been also evaluated for accuracy.To ensure the reliability of wetland status data, the project adhered to established quality assurance andquality control measures for data collection, analysis, verification and reporting.This study used well established, time-tested, fully documented data collection conventions. It employedskilled and trained personnel for image interpretation, processing and digital database creation. All interpretedimageries were reviewed by technical expert team for accuracy and code. The reviewing analyst adhered toall standards, quality requirements and technical specifications and reviewed 100 percent of the work. Thevarious stages of quality check include:1. Image-to-Image Geo-referencing/Data generation2. Reference layer preparation using NWIA post monsoon and pre-monsoon LISS-III data.3. Wetland mapping using visual/digital interpretation techniques.4. Geo-data base creation and organization5. Output products.6.1 Data verification and quality assurance of output digital data filesAll digital data files were subjected to rigorous quality control inspections. Digital data verification includedquality control checks that addressed the geospatial correctness, digital integrity and some cartographicaspects of the data. Implementation of quality checks ensured that the data conformed to the specifiedcriteria, thus achieving the project objectives. There were tremendous advantages in using newertechnologies to store and analyze the geographic data. The geospatial analysis capability built into this studyprovided a complete digital database to better assist analysis of wetland change information. All digital datafiles were subjected to rigorous quality control inspections. Automated checking modules incorporated in thegeographic information system (Arc/GIS) were used to correct digital artifacts including polygon topology.Additional customized data inspections were made to ensure that the changes indicated at the imageinterpretation stage were properly executed.14
Open waterMNDWI NDPI NDVIUseful for wetland boundary extraction/delineationG R NIRNDWI NDPI NDVIUseful for wetland vegetation & open water featuresG R SWIRLowHighLowThe Ox-Bow lakes and waterlogged areas adjacentto River in West Garo HillsIRS LISS III data, March 2007HighMNDWI MNDWI NDTIUseful for qualitative turbidity delineationFigure 9: Various combinations of the indices/spectral bands used to identify wetland components15
Page 1 and 2: NATIONAL WETLAND ATLAS:MEGHALAYASpo
Page 3 and 4: AtlasSAC/RESA/AFEG/NWIA/ATLAS/02/20
Page 5: MESSAGEIt gives me great pleasure t
Page 9: ACKNOWLEDGEMENTSThe project “Nati
Page 13 and 14: CONTENTS1.0 INTRODUCTION1.1 Wetland
Page 15 and 16: 1.0 INTRODUCTIONIt is increasingly
Page 17 and 18: REDGREENNIR RED GREENNIRIRS LISS II
Page 19 and 20: 2.0 NATIONAL WETLAND INVENTORY AND
Page 21 and 22: 3.0 STUDY AREAMeghalaya occupies th
Page 23 and 24: 4.0 DATA USEDRemote sensing dataIRS
Page 25 and 26: 25 March 200725 November 2007Figure
Page 27: Figure 8: Steps in the extraction o
Page 33 and 34: 7.0 WETLANDS OF MEGHALAYA: MAPS AND
Page 38: 7.1.1 Wetland Distribution in West
Page 46: 7.1.3 Wetland Distribution in South
Page 54: 7.1.5 Wetland Distribution in Ri Bh
Page 62: 7.1.7 Wetland Distribution in Jaint
Page 69 and 70: 8.0 MAJOR WETLAND TYPES OF MEGHALAY
Page 71: Sr. No.5.Wetland Type : LakesName:
Page 75 and 76: 9.0 IMPORTANT WETLANDS OF MEGHALAYA
Page 77: Plate 4: Wetland map - 5 km buffer
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Plate 6: Wetland map - 5 km buffer
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Plate 8: Wetland map - 5 km buffer
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REFERENCES1. Anon. 2005, NNRMS Stan
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1202 Tanks/Ponds: A term used in Ce
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Space Applications Centre (SAC) is
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Meghalaya - Ministry of Environment and Forests

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