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H3 pentagons

global

12 pentagon cells per resolution sit at icosahedron vertices; they break the 6-neighbour and regular-shape assumptions and have lower inscribed/circumscribed ratios.

H3 pentagons illustration — ▪ Rendered from the real conversion/geometry code.

Detection

isPentagon(cell).

Mitigation

Handle pentagons explicitly
Do not assume a hexagon inscribed ratio of cos(30°)
Report per-cell shape regularity

Read the full article: H3 Pentagons →

Affected conversions