Atlas · The Gambia / 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
2,866.7 ha
Largest patch 14.5% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove10,266.75.6313.4919, -15.7096
Mangrove4,651.35.2013.4666, -15.6510
Mangrove3,792.55.0913.4973, -15.4911
Mangrove3,484.35.0413.4609, -16.1876
Mangrove2,995.44.9613.2882, -16.2185
Mangrove2,368.04.8313.4590, -15.4217
Mangrove1,884.44.7113.4704, -16.1206
Mangrove1,582.74.6113.4620, -16.0163
Mangrove1,535.74.5913.2599, -16.1289
Mangrove1,497.24.5813.2580, -16.4912

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove2,367.9615.513.4590, -15.4217
Mangrove3,792.4714.413.4973, -15.4911
Mangrove4,651.2613.313.4666, -15.6510
Mangrove720.5911.813.3575, -16.1993
Mangrove721.5011.013.4563, -15.3469
Mangrove860.9411.013.3863, -16.2773
Mangrove10,266.709.713.4919, -15.7096
Mangrove3,484.269.513.4609, -16.1876
Mangrove2,995.379.313.2882, -16.2185
Mangrove1,497.218.313.2580, -16.4912
Mangrove308.948.213.2895, -16.0194
Mangrove637.428.113.3989, -16.0790
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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