Atlas · Madagascar
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Signals & Anomalies
Detailed mangrove analysis is not available for Chad yet. Here is what Atlas holds for it and what comes next.
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
956.6 ha
Largest patch 1.9% of area
Largest-size outliers
z-score of ln(area): how many standard deviations above typical
| Formation | Area (ha) | z | Location |
|---|---|---|---|
| Mangrove | 4,899.5 | 5.27 | -13.4235, 48.7798 |
| Mangrove | 4,399.4 | 5.21 | -15.5528, 47.0912 |
| Mangrove | 4,173.4 | 5.18 | -15.8137, 45.8773 |
| Mangrove | 3,902.0 | 5.14 | -13.3162, 48.8010 |
| Mangrove | 3,680.6 | 5.11 | -15.8398, 45.7625 |
| Mangrove | 3,259.5 | 5.04 | -15.4978, 47.1323 |
| Mangrove | 3,090.2 | 5.01 | -14.8853, 47.8758 |
| Mangrove | 2,767.5 | 4.95 | -12.9683, 48.9457 |
| Mangrove | 2,450.0 | 4.89 | -13.1783, 48.8131 |
| Mangrove | 2,308.9 | 4.85 | -16.0699, 45.5030 |
Most irregular outlines
Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges
| Formation | Area (ha) | Shape idx | Location |
|---|---|---|---|
| Mangrove | 4,399.40 | 18.4 | -15.5528, 47.0912 |
| Mangrove | 2,308.88 | 12.9 | -16.0699, 45.5030 |
| Mangrove | 398.14 | 12.5 | -16.1640, 44.9537 |
| Mangrove | 544.52 | 12.1 | -17.1995, 44.1333 |
| Mangrove | 4,899.46 | 11.7 | -13.4235, 48.7798 |
| Mangrove | 3,090.17 | 11.7 | -14.8853, 47.8758 |
| Mangrove | 1,200.94 | 11.7 | -19.1357, 44.2842 |
| Mangrove | 1,473.76 | 11.6 | -16.2367, 44.4593 |
| Mangrove | 728.17 | 11.5 | -15.5633, 46.9903 |
| Mangrove | 3,901.99 | 11.5 | -13.3162, 48.8010 |
| Mangrove | 365.26 | 11.3 | -17.5536, 43.9698 |
| Mangrove | 954.97 | 11.3 | -15.5340, 46.9821 |
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.