Atlas · São Tomé and Principe
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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
37.9 ha
Largest patch 76.0% of area
Largest-size outliers
z-score of ln(area): how many standard deviations above typical
| Formation | Area (ha) | z | Location |
|---|---|---|---|
| Mangrove | 48.9 | 2.23 | 0.0412, 6.5191 |
| Mangrove | 4.4 | 1.01 | 0.0457, 6.5296 |
| Mangrove | 3.3 | 0.87 | 0.0877, 6.5733 |
| Mangrove | 3.2 | 0.86 | 0.1320, 6.6442 |
| Mangrove | 2.4 | 0.71 | 0.1273, 6.6432 |
| Mangrove | 0.7 | 0.10 | 0.1341, 6.6458 |
| Mangrove | 0.4 | -0.14 | 0.1323, 6.6452 |
| Mangrove | 0.4 | -0.25 | 0.0878, 6.5749 |
| Mangrove | 0.2 | -0.60 | 0.0870, 6.5749 |
| Mangrove | 0.1 | -0.95 | 0.0459, 6.5318 |
Most irregular outlines
Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges
| Formation | Area (ha) | Shape idx | Location |
|---|---|---|---|
| Mangrove | 48.89 | 3.0 | 0.0412, 6.5191 |
| Mangrove | 2.41 | 2.4 | 0.1273, 6.6432 |
| Mangrove | 3.22 | 2.4 | 0.1320, 6.6442 |
| Mangrove | 4.38 | 2.2 | 0.0457, 6.5296 |
| Mangrove | 0.45 | 1.5 | 0.1323, 6.6452 |
| Mangrove | 0.36 | 1.4 | 0.0878, 6.5749 |
| Mangrove | 0.72 | 1.4 | 0.1341, 6.6458 |
| Mangrove | 3.31 | 1.3 | 0.0877, 6.5733 |
| Mangrove | 0.18 | 1.2 | 0.0870, 6.5749 |
| Mangrove | 0.09 | 1.1 | 0.0459, 6.5318 |
| Mangrove | 0.09 | 1.1 | 0.0443, 6.5253 |
| Mangrove | 0.09 | 1.1 | 0.0457, 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.