Atlas · Senegal / 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
2,138.0 ha
Largest patch 4.5% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove6,776.45.9513.8878, -16.5579
Mangrove5,915.75.8712.7746, -16.6924
Mangrove5,764.95.8513.9414, -16.7107
Mangrove5,319.95.8012.6622, -16.7175
Mangrove3,661.55.5812.7072, -16.5808
Mangrove3,510.75.5612.6628, -16.5325
Mangrove3,404.45.5412.7538, -16.6913
Mangrove3,384.65.5312.6339, -16.4740
Mangrove3,044.95.4713.6415, -16.5284
Mangrove2,897.05.4412.5989, -16.4163

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove2,897.0218.612.5989, -16.4163
Mangrove2,120.0417.712.5579, -16.4373
Mangrove5,764.8916.113.9414, -16.7107
Mangrove5,319.8615.812.6622, -16.7175
Mangrove1,252.2615.512.5547, -16.4848
Mangrove732.2715.412.8659, -16.5852
Mangrove654.8015.212.5305, -16.5040
Mangrove6,776.3914.513.8878, -16.5579
Mangrove1,081.0314.312.8317, -16.6271
Mangrove5,915.7213.912.7746, -16.6924
Mangrove3,404.4413.112.7538, -16.6913
Mangrove635.3612.712.8083, -16.5624
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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