Atlas · Tanzania / 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

FormationArea (ha)zLocation
Mangrove4,464.64.72-8.2308, 39.2953
Mangrove2,686.54.47-7.8684, 39.4305
Mangrove2,569.94.44-8.3219, 39.2630
Mangrove2,389.74.41-9.1132, 39.6025
Mangrove2,258.14.38-10.4294, 40.3643
Mangrove2,064.84.33-7.8441, 39.3380
Mangrove1,848.54.28-7.7635, 39.3227
Mangrove1,839.64.27-7.7347, 39.2943
Mangrove1,713.44.24-7.8331, 39.4128
Mangrove1,667.74.22-8.0276, 39.4182

Most irregular outlines

Shape index (perimeter ÷ circle perimeter): high values suggest jagged or sliver-like edges

FormationArea (ha)Shape idxLocation
Mangrove4,464.5914.3-8.2308, 39.2953
Mangrove2,569.8913.0-8.3219, 39.2630
Mangrove2,258.1211.3-10.4294, 40.3643
Mangrove2,686.4711.0-7.8684, 39.4305
Mangrove518.9610.2-8.9654, 39.4150
Mangrove1,443.8310.1-8.1718, 39.3546
Mangrove759.229.7-7.8279, 39.2794
Mangrove1,713.369.6-7.8331, 39.4128
Mangrove1,667.719.3-8.0276, 39.4182
Mangrove2,064.819.2-7.8441, 39.3380
Mangrove789.199.1-9.1384, 39.4887
Mangrove793.539.0-6.2012, 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.
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