On Wed, Apr 24, 2024 at 6:46 AM José Carlos Martínez via postgis-users <postgis-users@lists.osgeo.org> wrote: > I am making some changes in proj4text of the spatial_ref_sys table, to apply > a transformation between datums (+towgs84).
Don't make changes to existing, defined entries, make yourself a new entry. > It appears that PostGIS is not using the values from proj4text, and instead > is using the values from proj.db in the proj directory. Yes, if it can dereference an SRID to an entry in proj.db, that entry will be what is used. This allows richer and more correct transforms than can be achieved with the proj string entries alone. > I would like to ask if proj4text values still take priority (as in previous > versions), with respect to proj.db? > I mean, the first place PostGIS looks at the values to perform a coordinate > transformation is still proj4text? No, the first place is the proj.db. This is why if you want a custom system you should make a new entry. ATB, P > > Thanks > > Jose Martinez > >
