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Polar singularities
GlobalNear 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.
Detection
Cell centroid or boundary latitude within a few degrees of ±90°.
Mitigation
- Use geodesic (great-circle) buffering, never planar, near poles
- Flag and manually review any cell whose boundary vertices approach ±90° latitude
Affected conversions
- H3exact polygon
- H3inscribed circle
- H3circumscribed circle
- Point+radiusH3