Atlas · Guinea-Bissau / 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
2,179.4 ha
Largest patch 2.4% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove7,079.54.9612.1341, -16.2200
Mangrove6,869.24.9412.1548, -16.2200
Mangrove6,711.74.9312.3518, -16.1477
Mangrove6,519.14.9111.4227, -15.3779
Mangrove6,277.64.8912.2852, -16.4607
Mangrove5,846.74.8611.1211, -15.1163
Mangrove5,874.94.8612.3014, -16.0238
Mangrove5,677.44.8412.3124, -16.2530
Mangrove5,005.24.7811.0392, -15.1958
Mangrove4,947.84.7712.3370, -15.6151

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove6,869.1717.012.1548, -16.2200
Mangrove3,140.0815.612.3849, -15.5612
Mangrove6,519.1214.311.4227, -15.3779
Mangrove7,079.5214.012.1341, -16.2200
Mangrove2,968.7314.011.1917, -15.3541
Mangrove6,277.5613.812.2852, -16.4607
Mangrove3,365.2313.512.2887, -15.9508
Mangrove5,874.8813.012.3014, -16.0238
Mangrove1,960.2412.511.9250, -16.2522
Mangrove3,207.0212.411.3647, -15.3731
Mangrove2,748.8211.811.1518, -15.9440
Mangrove1,986.8711.712.3046, -15.8933
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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