Paul Ramsey <pram...@cleverelephant.ca> writes: > On Fri, Feb 4, 2022 at 2:23 PM Jim Klassen <klassen...@gmail.com> wrote: > >> We've been starting at 200000 and using EPSG (misusing the "EPSG" >> auth kept Proj 4/GDAL/MapServer happier, this likely isn't necessary >> with Proj 8). We maintain matching record(s) in our proj4 epsg >> database file (again this will change as we transition to Proj 8 >> which supports PROJ_AUX_DB). > > Slightly off topic, but a note to your and Paul Moen, that putting > "EPSG" into the auth_name means that in dereferencing the spatial > reference info PostGIS ends up calling into proj and saying "is this > bogus projection EPSG:9999999 projection valid?" which takes time. > Whereas if auth_name is null, PostGIS just skips right on down to > using the WKT. And if *that* is null, it can skip directly to using > the proj4text. So if you're really only using the proj4text, it > behooves you to leave everything else null.
Separately from the efficiency, I'm also a little conflicted about the EPSG dataset. Certainly it's a great contribution, but it doesn't meet the Free Software definition. We as a community have more or less made our peace with that, but it seems best to avoid injecting local resources into that namespace -- as well as against the spirit of how EPSG asks the dataset be handled.
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