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Exclaves
A region's territory disconnected from its main body (e.g. Kaliningrad, Alaska) is geometrically a separate multipolygon part; overlap-max joins can attribute it to the surrounding region instead of its true owner.
Class
Case to account for
Affects
2 conversions
01
Detection
Named multipolygon part is geographically non-adjacent to the region's other parts (large centroid gap, no shared boundary).
02
Mitigation
01
Preserve part-to-parent id mapping through the pipeline
02
Do not merge exclave parts with the geographically nearest neighbor by default
03
Affected conversions
Admin polygonsH3 (max-overlap partition)
OPENAdmin polygonsH3 (weighted crosswalk)
OPEN