Atlas · Tanzania
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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
941.2 ha
Largest patch 4.0% of area
Largest-size outliers
z-score of ln(area): how many standard deviations above typical
| Formation | Area (ha) | z | Location |
|---|---|---|---|
| Mangrove | 4,464.6 | 4.72 | -8.2308, 39.2953 |
| Mangrove | 2,686.5 | 4.47 | -7.8684, 39.4305 |
| Mangrove | 2,569.9 | 4.44 | -8.3219, 39.2630 |
| Mangrove | 2,389.7 | 4.41 | -9.1132, 39.6025 |
| Mangrove | 2,258.1 | 4.38 | -10.4294, 40.3643 |
| Mangrove | 2,064.8 | 4.33 | -7.8441, 39.3380 |
| Mangrove | 1,848.5 | 4.28 | -7.7635, 39.3227 |
| Mangrove | 1,839.6 | 4.27 | -7.7347, 39.2943 |
| Mangrove | 1,713.4 | 4.24 | -7.8331, 39.4128 |
| Mangrove | 1,667.7 | 4.22 | -8.0276, 39.4182 |
Most irregular outlines
Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges
| Formation | Area (ha) | Shape idx | Location |
|---|---|---|---|
| Mangrove | 4,464.59 | 14.3 | -8.2308, 39.2953 |
| Mangrove | 2,569.89 | 13.0 | -8.3219, 39.2630 |
| Mangrove | 2,258.12 | 11.3 | -10.4294, 40.3643 |
| Mangrove | 2,686.47 | 11.0 | -7.8684, 39.4305 |
| Mangrove | 518.96 | 10.2 | -8.9654, 39.4150 |
| Mangrove | 1,443.83 | 10.1 | -8.1718, 39.3546 |
| Mangrove | 759.22 | 9.7 | -7.8279, 39.2794 |
| Mangrove | 1,713.36 | 9.6 | -7.8331, 39.4128 |
| Mangrove | 1,667.71 | 9.3 | -8.0276, 39.4182 |
| Mangrove | 2,064.81 | 9.2 | -7.8441, 39.3380 |
| Mangrove | 789.19 | 9.1 | -9.1384, 39.4887 |
| Mangrove | 793.53 | 9.0 | -6.2012, 39.4258 |
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.