Atlas · Guinea-Bissau
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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
| Formation | Area (ha) | z | Location |
|---|---|---|---|
| Mangrove | 7,079.5 | 4.96 | 12.1341, -16.2200 |
| Mangrove | 6,869.2 | 4.94 | 12.1548, -16.2200 |
| Mangrove | 6,711.7 | 4.93 | 12.3518, -16.1477 |
| Mangrove | 6,519.1 | 4.91 | 11.4227, -15.3779 |
| Mangrove | 6,277.6 | 4.89 | 12.2852, -16.4607 |
| Mangrove | 5,846.7 | 4.86 | 11.1211, -15.1163 |
| Mangrove | 5,874.9 | 4.86 | 12.3014, -16.0238 |
| Mangrove | 5,677.4 | 4.84 | 12.3124, -16.2530 |
| Mangrove | 5,005.2 | 4.78 | 11.0392, -15.1958 |
| Mangrove | 4,947.8 | 4.77 | 12.3370, -15.6151 |
Most irregular outlines
Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges
| Formation | Area (ha) | Shape idx | Location |
|---|---|---|---|
| Mangrove | 6,869.17 | 17.0 | 12.1548, -16.2200 |
| Mangrove | 3,140.08 | 15.6 | 12.3849, -15.5612 |
| Mangrove | 6,519.12 | 14.3 | 11.4227, -15.3779 |
| Mangrove | 7,079.52 | 14.0 | 12.1341, -16.2200 |
| Mangrove | 2,968.73 | 14.0 | 11.1917, -15.3541 |
| Mangrove | 6,277.56 | 13.8 | 12.2852, -16.4607 |
| Mangrove | 3,365.23 | 13.5 | 12.2887, -15.9508 |
| Mangrove | 5,874.88 | 13.0 | 12.3014, -16.0238 |
| Mangrove | 1,960.24 | 12.5 | 11.9250, -16.2522 |
| Mangrove | 3,207.02 | 12.4 | 11.3647, -15.3731 |
| Mangrove | 2,748.82 | 11.8 | 11.1518, -15.9440 |
| Mangrove | 1,986.87 | 11.7 | 12.3046, -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.