Atlas · Eritrea / Species & Formations
EXPLORE

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
7,208 ha
1,166 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 1,1667,207.8
100.0%
6.180.26305.9 1.5514.386, 41.305
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
1,166
Mean patch
6.18 ha · median 0.259 ha
Largest patch
305.9 ha
Tiny patches (< 0.1 ha)
391 (33.5% of polygons)
Area in patches ≥ 10 ha
6,241 ha (86.6% of area)
Area in the largest 100 patches
6,123 ha (84.9%)
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
1Mangrove305.927,84414.7573, 40.7354 View on map →
2Mangrove279.727,29112.9683, 42.8476 View on map →
3Mangrove253.731,69015.7034, 40.1791 View on map →
4Mangrove251.929,06214.9584, 40.5159 View on map →
5Mangrove221.913,88015.6574, 40.2948 View on map →
6Mangrove213.215,80714.8918, 40.7071 View on map →
7Mangrove197.811,92813.0295, 42.8534 View on map →
8Mangrove170.918,98214.9026, 40.6766 View on map →
9Mangrove157.817,36414.8856, 40.6524 View on map →
10Mangrove149.717,94716.6269, 39.1469 View on map →
11Mangrove135.915,97416.1052, 39.4665 View on map →
12Mangrove121.918,52816.5123, 39.1606 View on map →
13Mangrove120.117,07712.9150, 42.9341 View on map →
14Mangrove103.813,31914.9762, 40.4470 View on map →
15Mangrove100.910,99312.9520, 42.9070 View on map →
Guest preview · 173s left Explore until the timer ends. Then you’ll be asked to log in or create an account (about two minutes) to keep going.
Ask Atlas