Atlas · Sierra Leone
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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
| Formation | Polygons | Area (ha) | Share | Mean patch (ha) |
|---|---|---|---|---|
| Mangrove | 8,520 | 149,725.0 | 100.0% | 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 cell | Polygons | Area (ha) | Gi* z |
|---|---|---|---|
| 7.55, -12.55 | 26 | 5 | 3.11 |
| 8.6, -13.1 | 44 | 1,136 | 3.07 |
| 7.55, -12.35 | 12 | 2,438 | 3.03 |
| 8.6, -13.15 | 34 | 1,524 | 3.00 |
| 8.55, -13.05 | 46 | 93 | 2.90 |
| 8.95, -13.25 | 255 | 1,435 | 2.83 |
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.