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ATLAS REPORT

Mangrove ecosystem report: Sierra Leone

Generated 15 October 2026, 07:50 from live Atlas data

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Executive summary

Atlas holds 216,141 mapped features and 37,971 observations in 25 datasets. The mapped mangrove canopy covers 149,725 ha in 8,520 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.177 ha, while patches of 10 ha or more hold 96.8% of the area. 0 ha (0.0%) lies within 10 km of the LAPSSET development footprint.

Single mapping epoch (2019). Areas are geodesic hectares recalculated from geometry.

Species & formations

FormationPolygonsArea (ha)ShareMean patch (ha)
Mangrove8,520149,725.0100.0%17.57
Shannon evenness by area: 0.00

Fragmentation & landscape metrics

Patches
8,520
Mean / median / largest
17.57 / 0.177 / 8,906.3 ha
Effective mesh size
2,890.8 ha
Largest patch index
5.9%
Power-law exponent α
1.50

Spatial clustering

Global Moran’s I = 0.245 (z = 7.4, p < 0.001). Hot-spot cells (Gi*, ≥95%): 41; cold-spot cells: 28.

Top hot-spot cellPolygonsArea (ha)Gi* z
7.55, -12.552653.11
8.6, -13.1441,1363.07
7.55, -12.35122,4383.03
8.6, -13.15341,5243.00
8.55, -13.0546932.90
8.95, -13.252551,4352.83

Methods & limits

Areas and lengths are recomputed on the WGS 84 ellipsoid; units are harmonised (ha, m, %, UTC). The mapping is a single 2019 epoch; the source publishes no licence; field plots are a sample; scenario figures are illustrative assumptions. Cite the original publishers listed above. Full methods: Methodologies page.
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