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ATLAS REPORT
Mangrove ecosystem report: Guinea
Generated 15 October 2026, 05:15 from live Atlas data
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Executive summary
Atlas holds 219,456 mapped features and 37,971 observations in 25 datasets. The mapped mangrove canopy covers 226,706 ha in 11,330 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.176 ha, while patches of 10 ha or more hold 97.4% 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 | 11,330 | 226,706.3 | 100.0% | 20.01 |
Shannon evenness by area: 0.00
Fragmentation & landscape metrics
- Patches
- 11,330
- Mean / median / largest
- 20.01 / 0.176 / 8,278.5 ha
- Effective mesh size
- 2,354.7 ha
- Largest patch index
- 3.7%
- Power-law exponent α
- 1.48
Spatial clustering
Global Moran’s I = 0.123 (z = 4.1, p < 0.001). Hot-spot cells (Gi*, ≥95%): 24; cold-spot cells: 15.
| Top hot-spot cell | Polygons | Area (ha) | Gi* z |
|---|---|---|---|
| 9.55, -13.55 | 35 | 336 | 2.92 |
| 9.35, -13.3 | 26 | 1,474 | 2.83 |
| 9.35, -13.35 | 37 | 1,567 | 2.73 |
| 9.6, -13.5 | 101 | 566 | 2.50 |
| 9.55, -13.45 | 68 | 1,292 | 2.39 |
| 9.5, -13.55 | 17 | 580 | 2.38 |
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.