Atlas · The Gambia
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ATLAS REPORT
Mangrove ecosystem report: The Gambia
Generated 15 October 2026, 04:02 from live Atlas data
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Executive summary
Atlas holds 84,775 mapped features and 37,971 observations in 21 datasets. The mapped mangrove canopy covers 70,792 ha in 3,090 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.174 ha, while patches of 10 ha or more hold 97.6% 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 | 3,090 | 70,791.8 | 100.0% | 22.91 |
Shannon evenness by area: 0.00
Fragmentation & landscape metrics
- Patches
- 3,090
- Mean / median / largest
- 22.91 / 0.174 / 10,266.7 ha
- Effective mesh size
- 2,866.7 ha
- Largest patch index
- 14.5%
- Power-law exponent α
- 1.49
Spatial clustering
Global Moran’s I = 0.011 (z = 0.4, p = 0.713). Hot-spot cells (Gi*, ≥95%): 13; cold-spot cells: 6.
| Top hot-spot cell | Polygons | Area (ha) | Gi* z |
|---|---|---|---|
| 13.3, -16.15 | 5 | 129 | 2.79 |
| 13.2, -16.15 | 25 | 215 | 2.63 |
| 13.2, -16.2 | 3 | 1,371 | 2.59 |
| 13.4, -16.25 | 22 | 99 | 2.51 |
| 13.45, -16.2 | 6 | 3,486 | 2.48 |
| 13.25, -16.15 | 15 | 2,614 | 2.47 |
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.