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Enclaves
A region entirely surrounded by another region's territory (e.g. Lesotho in South Africa) can be mis-assigned to the surrounding region by centroid- or overlap-based admin joins.
Class
Case to account for
Affects
3 conversions
01
Detection
Region polygon is fully contained within another region's polygon (within() true, not just intersects).
02
Mitigation
01
Use polygon-in-polygon precedence rules, inner region wins on containment
02
Maintain an explicit enclave/exclave exceptions list for known cases
03
Affected conversions
Admin polygonsH3 (max-overlap partition)
OPENAdmin polygonsH3 (weighted crosswalk)
OPENH3platform-native IDs
OPEN