Atlas · Angola / 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
3,305.4 ha
Largest patch 27.0% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove7,898.86.62-6.1012, 12.5321
Mangrove4,459.66.26-6.1241, 12.4902
Mangrove2,267.45.82-5.2222, 12.1692
Mangrove1,868.45.69-6.1157, 12.3021
Mangrove1,455.85.53-9.2536, 13.1937
Mangrove781.35.13-6.0478, 12.6218
Mangrove652.05.01-7.2060, 12.8868
Mangrove608.94.97-9.2079, 13.2009
Mangrove582.64.94-6.0651, 12.6675
Mangrove554.84.91-6.1745, 12.3903

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove7,898.7621.8-6.1012, 12.5321
Mangrove582.6012.0-6.0651, 12.6675
Mangrove781.319.8-6.0478, 12.6218
Mangrove4,459.619.5-6.1241, 12.4902
Mangrove2,267.428.8-5.2222, 12.1692
Mangrove1,868.458.6-6.1157, 12.3021
Mangrove554.767.8-6.1745, 12.3903
Mangrove489.487.7-7.7929, 13.0974
Mangrove145.097.4-6.9527, 12.8124
Mangrove275.687.1-6.0163, 12.7247
Mangrove171.496.8-6.0066, 12.7387
Mangrove99.466.3-8.1977, 13.2870
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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