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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
480 ha
237 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
| Formation | Polygons | Area (ha) | Share of area | Mean patch (ha) | Median patch (ha) | Largest patch (ha) | Shape index | Centre (lat, lon) |
|---|---|---|---|---|---|---|---|---|
| Mangrove | 237 | 479.9 | 100.0% |
2.02 | 0.34 | 45.9 | 1.49 | 19.360, 37.621 |
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
- 237
- Mean patch
- 2.02 ha · median 0.340 ha
- Largest patch
- 45.9 ha
- Tiny patches (< 0.1 ha)
- 67 (28.3% of polygons)
- Area in patches ≥ 10 ha
- 225 ha (47.0% of area)
- Area in the largest 100 patches
- 453 ha (94.5%)
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 insideField plots not loaded
The field survey dataset is not available.
The 15 largest mangrove patches
| # | Formation | Area (ha) | Perimeter (m) | Location | |
|---|---|---|---|---|---|
| 1 | Mangrove | 45.9 | 7,038 | 18.0869, 38.4683 | View on map → |
| 2 | Mangrove | 36.5 | 7,421 | 18.7425, 37.5150 | View on map → |
| 3 | Mangrove | 26.6 | 3,774 | 18.0274, 38.5683 | View on map → |
| 4 | Mangrove | 22.5 | 4,983 | 18.7598, 37.4985 | View on map → |
| 5 | Mangrove | 18.0 | 4,154 | 19.3058, 37.3212 | View on map → |
| 6 | Mangrove | 15.0 | 3,493 | 18.1303, 38.5040 | View on map → |
| 7 | Mangrove | 14.1 | 3,997 | 20.7563, 37.2579 | View on map → |
| 8 | Mangrove | 13.5 | 2,446 | 18.0688, 38.5232 | View on map → |
| 9 | Mangrove | 11.4 | 2,731 | 18.1044, 38.4435 | View on map → |
| 10 | Mangrove | 11.3 | 3,159 | 18.0737, 38.4999 | View on map → |
| 11 | Mangrove | 10.7 | 2,430 | 18.0745, 38.4836 | View on map → |
| 12 | Mangrove | 9.9 | 2,523 | 19.3067, 37.3246 | View on map → |
| 13 | Mangrove | 8.8 | 1,696 | 18.1343, 38.4592 | View on map → |
| 14 | Mangrove | 8.7 | 2,880 | 19.5004, 37.2819 | View on map → |
| 15 | Mangrove | 8.7 | 2,499 | 18.2173, 38.3127 | View on map → |