Atlas · Djibouti / 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
555 ha
82 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 82554.5
100.0%
6.760.87205.2 1.6612.082, 43.286
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
82
Mean patch
6.76 ha · median 0.875 ha
Largest patch
205.2 ha
Tiny patches (< 0.1 ha)
25 (30.5% of polygons)
Area in patches ≥ 10 ha
436 ha (78.7% of area)
Area in the largest 100 patches
555 ha (100.0%)
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
1Mangrove205.227,70612.1513, 43.4034 View on map →
2Mangrove111.614,03812.3634, 43.3521 View on map →
3Mangrove45.76,27311.5148, 43.2036 View on map →
4Mangrove17.32,95211.5889, 43.1283 View on map →
5Mangrove17.23,79311.7247, 43.2094 View on map →
6Mangrove14.43,61412.1955, 43.4010 View on map →
7Mangrove12.82,72212.4034, 43.3341 View on map →
8Mangrove12.22,12712.4724, 43.2894 View on map →
9Mangrove8.42,06612.4561, 43.3010 View on map →
10Mangrove7.92,25412.4132, 43.3290 View on map →
11Mangrove7.32,12911.7188, 43.2071 View on map →
12Mangrove7.22,36411.5884, 43.1203 View on map →
13Mangrove6.41,65812.1823, 43.4015 View on map →
14Mangrove5.21,65412.4537, 43.3058 View on map →
15Mangrove4.61,24412.4578, 43.3106 View on map →
Guest preview · 170s 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