By Ether Data
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Duplicated region IDs

Data quality

The same admin id mapping to multiple polygons (data error) breaks partition assumptions.

Detection

id appears on > 1 disjoint feature unexpectedly.

Mitigation

  • Dedupe / union by id
  • Fail loudly on unexpected duplicates

Affected conversions

  • Admin polygonsH3 (max-overlap partition)
  • Admin polygonsH3 (weighted crosswalk)