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Water-only cells
GlobalCells whose entire footprint is open water (ocean, large lake) carry no population/audience but can still be generated by a naive grid fill over a bounding box or coastal buffer.
Detection
Cell polygon land-fraction approximately 0 against a land/water mask.
Mitigation
- Mask against a land polygon before finalizing a cell set
- Exclude or down-weight zero-land cells in audience/delivery counts
Affected conversions
- PolygonH3 (intersects)
- Point+radiusH3
- RasterH3