Mangrove Development in Fiji from 1991 to 2007
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Mangrove Development in Fiji from 1991 to 2007
Vilisi TokalauvereSPC-SOPAC
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Apply geo-science and technology to realise new opportunities for improving the livelihoods of Pacific communities.
Data Sources
Landsat Image 1991 FOCO 1991/2001 Landsat Image 2001 ALOS 2007
Visual Interpretation
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Apply geo-science and technology to realise new opportunities for improving the livelihoods of Pacific communities.
Description Database
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MapInfo to ERDAS
Forest, Mangrove polygons exported (DXF) to ERDAS.
Add Projection. Convert to raster. Recode polygon values. Add to forest cover layer. Now all handled by ArcGIS (spatial
analyst)
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Overlay Analysis 1:50,000
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Reducing to Mappable Area Size
Clump
Eliminate
Cluster No. 23841.2 ha
All clusters < 1 hectare are joined with the next biggest neighbour class
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1Hectare Accumulation
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Output from Access DatabaseID Hectare Legend
R22 -----------------------------------------------------------------------------------------
1 Stable Natural Forest22 2,739Mangrove in 1991 and mangrove in 200111 49,791Natural forest in 1991 and natural forest in 2001SUM 52,530 2 Reforestation Natural Forest71 12Water body in 1991 and natural forest in 200161 2Non forest in 1991 and natural forest in 200172 364Water body in 1991 and mangrove in 2001SUM 378 3 Deforestation Natural Forest25 166Mangrove in 1991 and coconut cover in 200115 212Natural forest in 1991 and coconut cover in 200116 231Natural forest in 1991 and non forest in 2001
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Deforestation of Mangroves
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Reforestation of Mangroves
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ResultsYEAR VITI LEVU
(ha)VANUA LEVU(ha)
OUTER ISLANDS(ha)
1991 24, 230 215, 570 760
2001 24, 600 18, 250 750
2007 24, 600 19, 760 710
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Vanua LevuMap_ID 1991 2001 2007 SUM
O23 1,860 1,939 1,936 77O24 2,415 2,404 2,410 -5P22 412 411 411 -1P23 2,996 2,859 2,854 -142P24 3,046 2,901 2,901 -145Q22 3,408 3,434 3,432 25Q23 490 477 477 -13Q24 241 191 191 -50R22 2,860 1,125 2,638 -222R23 2,757 1,576 1,579 -1,178R24 680 590 590 -90S21 230 217 217 -13S22 81 93 93 11S23 91 34 34 -58S24 0 0 0 0SUM 21,567 18,250 19,764 -1,804
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RhyzophoraBruguiera
Coconut
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Thanks ………