Re: Geometry / geography woes

"nikolai.berkoff via postgis-users" <[email protected]> Wed, 10 Sep 2025 13:39:15 +0000

Newsgroups	gmane.comp.gis.postgis
Message-ID	<yCWJTAmliMs0rAIIXWmBYf8G5MBRTFYsoH1GSOYd70Bq153r4tZPPP6Yc1FuUvEy6vGs9joSMVQI65oa18Zd9bvrTCvn_rKsPWoY9ib8jTk=@pm.me>

Thank you,

A local coordinate system would not work for us as we are calling ST_Subdivide on the ranges of all species in the IUCN Redlist, so it is very much global problem.  I believe ST_Segmentize would solve this for us.

Would you consider a documentation update to ST_Subdivide and the the FAQ warning about this?

For the FAQ something like:


NOTE: If you plan to re-project geometries after using ST_Subdivide(), be aware that the subdivision process may introduce additional vertices. These new vertices do not affect the geometry in the original coordinate system, but they can alter its shape when re-projected — especially if the original vertices span large distances. To mitigate this, consider applying ST_Segmentize() to your geometries before subdivision, ensuring that vertex spacing is appropriate for the target projection or geography-based calculations.

and putting the example Regina gave in https://postgis.net/docs/ST_Subdivide.html ?  I would happily make a PR.

signature.asc (application/pgp-signature, 603 B)