Atlas · São Tomé and Principe / 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
37.9 ha
Largest patch 76.0% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove48.92.230.0412, 6.5191
Mangrove4.41.010.0457, 6.5296
Mangrove3.30.870.0877, 6.5733
Mangrove3.20.860.1320, 6.6442
Mangrove2.40.710.1273, 6.6432
Mangrove0.70.100.1341, 6.6458
Mangrove0.4-0.140.1323, 6.6452
Mangrove0.4-0.250.0878, 6.5749
Mangrove0.2-0.600.0870, 6.5749
Mangrove0.1-0.950.0459, 6.5318

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove48.893.00.0412, 6.5191
Mangrove2.412.40.1273, 6.6432
Mangrove3.222.40.1320, 6.6442
Mangrove4.382.20.0457, 6.5296
Mangrove0.451.50.1323, 6.6452
Mangrove0.361.40.0878, 6.5749
Mangrove0.721.40.1341, 6.6458
Mangrove3.311.30.0877, 6.5733
Mangrove0.181.20.0870, 6.5749
Mangrove0.091.10.0459, 6.5318
Mangrove0.091.10.0443, 6.5253
Mangrove0.091.10.0457, 6.5321
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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