Mangrove Development in Fiji from 1991 to 2007

Vilisi TokalauvereSPC-SOPAC

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Data Sources

Landsat Image 1991 FOCO 1991/2001 Landsat Image 2001 ALOS 2007

Visual Interpretation

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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 ………