Atlas · South Africa / 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
280.6 ha
Largest patch 32.9% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove659.24.58-28.8286, 32.0257
Mangrove286.54.08-28.8240, 31.9896
Mangrove126.53.59-31.6886, 29.4120
Mangrove79.03.31-28.8133, 32.0291
Mangrove77.43.29-28.9532, 31.7858
Mangrove51.83.05-33.2771, 27.4713
Mangrove50.63.04-26.9072, 32.8723
Mangrove47.13.00-28.7943, 32.0694
Mangrove44.52.96-28.7986, 32.0260
Mangrove41.22.91-28.8142, 32.0267

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove77.364.8-28.9532, 31.7858
Mangrove50.594.8-26.9072, 32.8723
Mangrove41.174.6-28.8142, 32.0267
Mangrove126.494.4-31.6886, 29.4120
Mangrove659.194.4-28.8286, 32.0257
Mangrove51.774.0-33.2771, 27.4713
Mangrove286.483.8-28.8240, 31.9896
Mangrove79.033.6-28.8133, 32.0291
Mangrove5.563.5-31.9422, 29.1814
Mangrove7.323.2-31.8488, 29.2703
Mangrove3.063.1-28.7878, 32.0198
Mangrove7.313.0-28.7945, 32.0053
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.
Guest preview · 173s left Explore until the timer ends. Then you’ll be asked to log in or create an account (about two minutes) to keep going.
Ask Atlas