Mangrove Development
in Fiji from 1991 to 2007
Vilisi Tokalauvere
SPC-SOPAC
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. 2384
1.2 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 Database
ID
R22
Hectare
Legend
----------------------------------------------------------------------------------------1 Stable Natural Forest
22
2,739Mangrove in 1991 and mangrove in 2001
11
49,791Natural forest in 1991 and natural forest in 2001
SUM
52,530
2 Reforestation Natural Forest
71
12Water body in 1991 and natural forest in 2001
61
2Non forest in 1991 and natural forest in 2001
72
364Water body in 1991 and mangrove in 2001
SUM
378
3 Deforestation Natural Forest
25
166Mangrove in 1991 and coconut cover in 2001
15
212Natural forest in 1991 and coconut cover in 2001
16
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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Results
YEAR
VITI LEVU
(ha)
VANUA LEVU OUTER
(ha)
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 Levu
Map_ID 1991
2001
2007
SUM
O23
1,860
1,939
1,936
77
O24
2,415
2,404
2,410
-5
P22
412
411
411
-1
P23
2,996
2,859
2,854
-142
P24
3,046
2,901
2,901
-145
Q22
3,408
3,434
3,432
25
Q23
490
477
477
-13
Q24
241
191
191
-50
R22
2,860
1,125
2,638
-222
R23
2,757
1,576
1,579 -1,178
R24
680
590
590
-90
S21
230
217
217
-13
S22
81
93
93
11
S23
91
34
34
-58
S24
0
0
0
0
SUM
21,567 18,250 19,764 -1,804
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Rhyzophora
Bruguiera
Coconut
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Pacific communities.
Thanks ………
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