Dont get h3_polygon_to_cells to work

[stefluhh]

Hi,

I am new to h3 and am trying to get this function to work like this:

SELECT h3_polygon_to_cells(polygon(way), array[]::polygon[], 8) FROM planet_osm_polygon where admin_level = '4' LIMIT 5;

Do I do something wrong? The query returns 0 results and when I remove admin_level = '4' runs forever, even though this query returns a count of 8:

SELECT count(*) FROM planet_osm_polygon WHERE admin_level = '4';

[zachasme]

Hi stefano! Have you tried increasing the resolution parameter for polygon_to_cells to something higher than 8? What does polygon way look like?

[stefluhh]

Hi Zacharias! I think the polygon is just too big.
I developed a different, very fast way to map polygons to their respective h3 index.
Just render a geometry out of each h3 index and cache it next to each h3's geohash in a table.
Then ST_INTERSECT them with each polygon, make sure you hit a spatial index. Query takes seconds for an entire state of Germany.

Thanks for the awesome h3 library.

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[AbelVM]

It would be way easier and faster if you subdivide the polygons first, as in https://carto.com/blog/subdivide-all-things/.

The polyfill function is quite memory demanding and big and/or complex polygons really stretch the limits. Just using firstST_Subdivide and then h3_polygon_to_cells will help a lot, usually