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Back to the catalogueData qualityCase 05 of 14
Duplicated region IDs
The same admin id mapping to multiple polygons (data error) breaks partition assumptions.
Class
Case to account for
Affects
2 conversions
01
Detection
id appears on > 1 disjoint feature unexpectedly.
02
Mitigation
01
Dedupe / union by id
02
Fail loudly on unexpected duplicates
03
Affected conversions
Admin polygonsH3 (max-overlap partition)
OPENAdmin polygonsH3 (weighted crosswalk)
OPENMore in Data quality
Accuracy-radius attritionAxis-order reversal (lat/lng swap)Coastal / mixed pixelsConfidence-convention mismatchGeocoding uncertaintyIncomplete geometryMissing CRS declarationMissing polygonsRaster no-data valuesRaster/cell resolution mismatchRounded / truncated coordinatesWrong CRS assumedZero-island coordinates