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Polar singularities
Near the North/South poles, longitude lines converge to a point; planar buffering and equirectangular projections badly distort cell shape and area right at the pole cells.
Class
Case to account for
Affects
4 conversions
01
Detection
Cell centroid or boundary latitude within a few degrees of ±90°.
02
Mitigation
01
Use geodesic (great-circle) buffering, never planar, near poles
02
Flag and manually review any cell whose boundary vertices approach ±90° latitude
03
Affected conversions
H3exact polygon
OPENH3inscribed circle
OPENH3circumscribed circle
OPENPoint+radiusH3
OPEN