Atlas · Guinea-Bissau
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ATLAS REPORT
Mangrove ecosystem report: Guinea-Bissau
Generated 15 October 2026, 12:06 from live Atlas data
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Executive summary
Atlas holds 231,506 mapped features and 37,971 observations in 23 datasets. The mapped mangrove canopy covers 297,120 ha in 12,944 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.175 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 | 12,944 | 297,120.3 | 100.0% | 22.95 |
Shannon evenness by area: 0.00
Fragmentation & landscape metrics
- Patches
- 12,944
- Mean / median / largest
- 22.95 / 0.175 / 7,079.5 ha
- Effective mesh size
- 2,179.4 ha
- Largest patch index
- 2.4%
- Power-law exponent α
- 1.46
Spatial clustering
Global Moran’s I = 0.152 (z = 6.7, p < 0.001). Hot-spot cells (Gi*, ≥95%): 67; cold-spot cells: 36.
| Top hot-spot cell | Polygons | Area (ha) | Gi* z |
|---|---|---|---|
| 11.95, -15.95 | 5 | 1,724 | 3.47 |
| 12, -15.95 | 15 | 698 | 3.42 |
| 11.2, -15.25 | 62 | 863 | 3.29 |
| 11.85, -16.05 | 3 | 757 | 3.27 |
| 11.95, -15.75 | 13 | 1,223 | 3.16 |
| 11.1, -16.05 | 12 | 765 | 3.13 |
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.