Atlas · Djibouti / 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
105.1 ha
Largest patch 37.0% of area

Largest-size outliers

z-score of ln(area): how many standard deviations above typical

FormationArea (ha)zLocation
Mangrove205.22.8112.1513, 43.4034
Mangrove111.62.5012.3634, 43.3521
Mangrove45.72.0511.5148, 43.2036
Mangrove17.31.5511.5889, 43.1283
Mangrove17.21.5511.7247, 43.2094
Mangrove14.41.4612.1955, 43.4010
Mangrove12.81.4012.4034, 43.3341
Mangrove12.21.3812.4724, 43.2894
Mangrove8.41.1912.4561, 43.3010
Mangrove7.91.1612.4132, 43.3290

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove205.205.512.1513, 43.4034
Mangrove111.653.712.3634, 43.3521
Mangrove4.472.811.5860, 43.1125
Mangrove14.422.712.1955, 43.4010
Mangrove3.502.711.5830, 43.1059
Mangrove45.742.611.5148, 43.2036
Mangrove17.162.611.7247, 43.2094
Mangrove4.022.512.4095, 43.3313
Mangrove7.182.511.5884, 43.1203
Mangrove2.542.312.1882, 43.4027
Mangrove4.452.312.4621, 43.3135
Mangrove7.952.312.4132, 43.3290
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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