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Methodologies
METHODOLOGIES
Proximity to pressures
Distance bands from LAPSSET and villages.
Method
For each mangrove polygon a representative point is taken (ST_PointOnSurface). Distance to the union of the reference geometries is measured on the ellipsoid in kilometres and polygons are binned (≤2, 2–5, 5–10, 10–25, >25 km). Areas in each band are summed.
Limits. Straight-line distance, not travel time or hydrological connectivity. Only 52 villages are mapped, so village proximity is a lower bound.
Related reading
More in Methodologies
- How Global Mangrove Watch maps are made
- The rules behind recommendations
- Fragmentation metrics
- Confidence labels: calculated, illustrative, assumed
- Spatial statistics: Moran's I and Getis-Ord Gi*
- How features are assigned to countries
- Carbon assumptions used in scenarios
- Diversity: Shannon index and evenness
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