Atlas · Madagascar / 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
956.6 ha
Largest patch 1.9% of area

Largest-size outliers

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

FormationArea (ha)zLocation
Mangrove4,899.55.27-13.4235, 48.7798
Mangrove4,399.45.21-15.5528, 47.0912
Mangrove4,173.45.18-15.8137, 45.8773
Mangrove3,902.05.14-13.3162, 48.8010
Mangrove3,680.65.11-15.8398, 45.7625
Mangrove3,259.55.04-15.4978, 47.1323
Mangrove3,090.25.01-14.8853, 47.8758
Mangrove2,767.54.95-12.9683, 48.9457
Mangrove2,450.04.89-13.1783, 48.8131
Mangrove2,308.94.85-16.0699, 45.5030

Most irregular outlines

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

FormationArea (ha)Shape idxLocation
Mangrove4,399.4018.4-15.5528, 47.0912
Mangrove2,308.8812.9-16.0699, 45.5030
Mangrove398.1412.5-16.1640, 44.9537
Mangrove544.5212.1-17.1995, 44.1333
Mangrove4,899.4611.7-13.4235, 48.7798
Mangrove3,090.1711.7-14.8853, 47.8758
Mangrove1,200.9411.7-19.1357, 44.2842
Mangrove1,473.7611.6-16.2367, 44.4593
Mangrove728.1711.5-15.5633, 46.9903
Mangrove3,901.9911.5-13.3162, 48.8010
Mangrove365.2611.3-17.5536, 43.9698
Mangrove954.9711.3-15.5340, 46.9821
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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