Atlas · Angola
/
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
3,305.4 ha
Largest patch 27.0% of area
Largest-size outliers
z-score of ln(area): how many standard deviations above typical
| Formation | Area (ha) | z | Location |
|---|---|---|---|
| Mangrove | 7,898.8 | 6.62 | -6.1012, 12.5321 |
| Mangrove | 4,459.6 | 6.26 | -6.1241, 12.4902 |
| Mangrove | 2,267.4 | 5.82 | -5.2222, 12.1692 |
| Mangrove | 1,868.4 | 5.69 | -6.1157, 12.3021 |
| Mangrove | 1,455.8 | 5.53 | -9.2536, 13.1937 |
| Mangrove | 781.3 | 5.13 | -6.0478, 12.6218 |
| Mangrove | 652.0 | 5.01 | -7.2060, 12.8868 |
| Mangrove | 608.9 | 4.97 | -9.2079, 13.2009 |
| Mangrove | 582.6 | 4.94 | -6.0651, 12.6675 |
| Mangrove | 554.8 | 4.91 | -6.1745, 12.3903 |
Most irregular outlines
Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges
| Formation | Area (ha) | Shape idx | Location |
|---|---|---|---|
| Mangrove | 7,898.76 | 21.8 | -6.1012, 12.5321 |
| Mangrove | 582.60 | 12.0 | -6.0651, 12.6675 |
| Mangrove | 781.31 | 9.8 | -6.0478, 12.6218 |
| Mangrove | 4,459.61 | 9.5 | -6.1241, 12.4902 |
| Mangrove | 2,267.42 | 8.8 | -5.2222, 12.1692 |
| Mangrove | 1,868.45 | 8.6 | -6.1157, 12.3021 |
| Mangrove | 554.76 | 7.8 | -6.1745, 12.3903 |
| Mangrove | 489.48 | 7.7 | -7.7929, 13.0974 |
| Mangrove | 145.09 | 7.4 | -6.9527, 12.8124 |
| Mangrove | 275.68 | 7.1 | -6.0163, 12.7247 |
| Mangrove | 171.49 | 6.8 | -6.0066, 12.7387 |
| Mangrove | 99.46 | 6.3 | -8.1977, 13.2870 |
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.