Atlas · Seychelles / 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
106.7 ha
Largest patch 15.6% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove256.94.72-9.4270, 46.4317
Mangrove202.84.55-9.4206, 46.4856
Mangrove186.74.49-9.3831, 46.3845
Mangrove118.24.17-9.3965, 46.2207
Mangrove105.14.09-9.7164, 47.5129
Mangrove51.33.59-9.3801, 46.3406
Mangrove36.53.35-9.4682, 46.2832
Mangrove21.52.99-9.4267, 46.2511
Mangrove21.02.97-9.3804, 46.4340
Mangrove19.52.92-9.4625, 46.2460

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove186.677.5-9.3831, 46.3845
Mangrove256.946.8-9.4270, 46.4317
Mangrove51.255.8-9.3801, 46.3406
Mangrove202.795.5-9.4206, 46.4856
Mangrove118.204.8-9.3965, 46.2207
Mangrove14.564.0-9.3809, 46.3131
Mangrove105.144.0-9.7164, 47.5129
Mangrove36.514.0-9.4682, 46.2832
Mangrove19.493.8-9.4625, 46.2460
Mangrove11.293.7-9.3806, 46.3033
Mangrove21.003.5-9.3804, 46.4340
Mangrove12.443.3-9.3820, 46.3513
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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