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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
9,126 ha
2,198 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 2,1989,125.9
100.0%
4.150.183,425.3 1.415.535, -0.212
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
2,198
Mean patch
4.15 ha · median 0.178 ha
Largest patch
3,425.3 ha
Tiny patches (< 0.1 ha)
886 (40.3% of polygons)
Area in patches ≥ 10 ha
7,931 ha (86.9% of area)
Area in the largest 100 patches
8,177 ha (89.6%)
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
1Mangrove3,425.3408,1915.8226, 0.7475 View on map →
2Mangrove436.947,1524.9252, -2.2153 View on map →
3Mangrove365.556,1154.9627, -2.4281 View on map →
4Mangrove289.139,0315.0389, -1.6124 View on map →
5Mangrove287.831,0765.7840, 0.8130 View on map →
6Mangrove277.537,9024.8387, -1.9019 View on map →
7Mangrove253.427,8125.0263, -1.6280 View on map →
8Mangrove241.437,2195.7897, 0.7044 View on map →
9Mangrove188.826,3025.7975, 0.7173 View on map →
10Mangrove161.438,5025.0287, -2.7689 View on map →
11Mangrove148.619,1024.7703, -2.0102 View on map →
12Mangrove142.115,8794.8058, -2.1564 View on map →
13Mangrove118.615,4604.9228, -2.2676 View on map →
14Mangrove112.517,0695.0406, -1.5922 View on map →
15Mangrove74.513,9694.8061, -2.1253 View on map →
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