Polyfill returning all intersecting hexagons, expansion of polygon factor.

[rustyconover]

I'm attempting to have polyfill return all hexagons intersected rather than just those hexagon's that have a center contained in the passed polygon.

It's been suggested that expanding the polygon by the average edge length of a hexagon at the target resolution is sufficient to ensure that the polygon is covered by polyfill. I've found that this isn't the case at various resolutions.

Please see this notebook:

https://observablehq.com/@rustyconover/ensuring-h3-polyfill-returns-all-hexagons-for-a-polygon

It seems that resolution 5 and expanding the polygon by the average hexagon edge length polyfill fails to find any intersecting hexagons.

By expanding by a factor of ~1.5 to 2 times the average hexagon length it seems that at all resolutions the polygon is completely covered. Is there a better procedure to follow for having polyfill return all intersecting hexagons?

[dfellis]

See my answer here.

[rustyconover]

@dfellis Thats a perfect answer, thank you!