Atlas · Guinea-Bissau / Species & Formations
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Species & Formations

A closer look at the seven mangrove species formations mapped across the Lamu seascape (2019): how much of each there is, how it is patched together and how well the map agrees with what field teams found on the ground.

Formation classes
1
Distinct mapped classes
Mapped mangrove area
297,120 ha
12,944 polygons
Dominant by area
Mangrove
100.0% of mapped area
Evenness (Shannon, by area)
0.00
0 = one class dominates · 1 = perfectly even

How much of each formation?

Area is calculated from the stored geometry (hectares, WGS 84 ellipsoid)

Mapped area by formation

Hectares

Source: WWF Kenya / KMFRI / KFS. Atlas recalculates every area from the geometry so all datasets share one unit.

Share of the number of polygons

How fragmented each formation is

Formation profile table

FormationPolygonsArea (ha)Share of areaMean patch (ha)Median patch (ha)Largest patch (ha)Shape indexCentre (lat, lon)
Mangrove 12,944297,120.3
100.0%
22.950.187,079.5 1.5711.722, -15.574
Shape index = perimeter ÷ perimeter of a circle of the same area (1.0 = circle; higher = more irregular/elongated edge).

Patch structure

Mangrove stands are made of patches. Many small patches means a fragmented canopy.

Polygons by size class

Count and area per size class

Fragmentation indicators

Polygons
12,944
Mean patch
22.95 ha · median 0.175 ha
Largest patch
7,079.5 ha
Tiny patches (< 0.1 ha)
5,315 (41.1% of polygons)
Area in patches ≥ 10 ha
289,314 ha (97.4% of area)
Area in the largest 100 patches
191,686 ha (64.5%)
How to read it: a long tail of tiny polygons next to a few very large ones is typical of satellite-derived classification of dense mangrove — it reflects mapping detail as much as real fragmentation.

North – south composition

Formation area in 0.1° latitude bands (about 11 km each)

Does the map match the ground?

Field survey plots tested against the mapped polygon each one falls inside
Field plots not loaded
The field survey dataset is not available.

The 15 largest mangrove patches

#FormationArea (ha)Perimeter (m)Location
1Mangrove7,079.5418,82212.1341, -16.2200 View on map →
2Mangrove6,869.2500,79112.1548, -16.2200 View on map →
3Mangrove6,711.7336,76812.3518, -16.1477 View on map →
4Mangrove6,519.1409,22611.4227, -15.3779 View on map →
5Mangrove6,277.6388,31412.2852, -16.4607 View on map →
6Mangrove5,874.9352,14912.3014, -16.0238 View on map →
7Mangrove5,846.7284,41311.1211, -15.1163 View on map →
8Mangrove5,677.4287,93112.3124, -16.2530 View on map →
9Mangrove5,005.2200,52711.0392, -15.1958 View on map →
10Mangrove4,947.8280,06412.3370, -15.6151 View on map →
11Mangrove3,514.5198,64011.7212, -15.5221 View on map →
12Mangrove3,365.2278,03512.2887, -15.9508 View on map →
13Mangrove3,207.0248,52611.3647, -15.3731 View on map →
14Mangrove3,168.2203,51512.0335, -16.2478 View on map →
15Mangrove3,140.1309,47512.3849, -15.5612 View on map →
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