Polygon holes

Geometry

Interior rings (donuts) must be respected so cells inside a hole are excluded.

Detection

Polygon has > 1 ring.

Mitigation

  • Pass all rings to the filler
  • Verify hole winding (CW) after normalization

Affected conversions

  • PolygonH3 (center-contained)
  • PolygonH3 (fully-contained)
  • PolygonH3 (intersects)