Atlas · Nigeria / Signals & Anomalies
INTELLIGENCE

Signals & anomalies

Statistical checks that flag polygons and patterns that look unusual. They are prompts for review, not errors: an unusual polygon can be a real feature.

Polygons < 0.01 ha
0
0.0% of all polygons
Polygons < 0.001 ha
0
Likely slivers (≈ 10 m²)
Geometries repaired
55,235
Invalid shapes fixed on import
Effective mesh size
8,706.2 ha
Largest patch 4.4% of area

Largest-size outliers

z-score of ln(area): how many standard deviations above typical

FormationArea (ha)zLocation
Mangrove36,185.57.814.5102, 6.4466
Mangrove26,830.77.614.6452, 6.6908
Mangrove23,501.57.534.6646, 5.7723
Mangrove22,951.27.514.5127, 6.5794
Mangrove22,390.07.504.5641, 5.7665
Mangrove21,665.17.484.7490, 5.6079
Mangrove20,804.77.455.8851, 5.4927
Mangrove16,876.27.315.8018, 5.2877
Mangrove13,395.37.165.2427, 5.5574
Mangrove13,108.97.155.7625, 5.4155

Most irregular outlines

Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges

FormationArea (ha)Shape idxLocation
Mangrove20,804.6627.55.8851, 5.4927
Mangrove13,108.8820.85.7625, 5.4155
Mangrove924.6720.34.9559, 8.2645
Mangrove26,830.6819.14.6452, 6.6908
Mangrove16,876.1918.55.8018, 5.2877
Mangrove13,395.2917.85.2427, 5.5574
Mangrove36,185.4817.24.5102, 6.4466
Mangrove1,139.8316.65.8352, 5.5587
Mangrove10,866.3616.04.8632, 8.3275
Mangrove6,350.2116.05.5186, 5.3513
Mangrove502.9715.94.9802, 8.2351
Mangrove1,858.1115.25.7819, 5.5170
How to use this page. Check flagged polygons against recent satellite imagery. Remove genuine mapping artefacts in the next source update; keep real features. Atlas never edits the source data silently.
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