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List:       postgis-users
Subject:    Re: [postgis-users] ST_Transform Z heights between ODN and WSG [solved]
From:       Paul Ramsey <pramsey () cleverelephant ! ca>
Date:       2023-02-27 17:36:21
Message-ID: CACowWR3BBkir1M_6P5=j1ubJWF5q8dvqxB5PwHSgSATA+XqTvA () mail ! gmail ! com
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Put a whole write-up here
http://blog.cleverelephant.ca/2023/02/proj-network.html

On Thu, Feb 2, 2023 at 8:00 AM Paul Ramsey <pramsey@cleverelephant.ca> wrote:
> 
> 
> 
> > On Feb 2, 2023, at 1:58 AM, James Howe <jmh205@cam.ac.uk> wrote:
> > 
> > Thanks for the help to look in the right direction.
> > I downloaded the missing data files and it works now.
> > 
> > # projsync --system-directory --source-id uk_os
> > 
> > postgres=# SELECT st_asewkt(ST_Transform('SRID=7405;POINT(545068 258591 \
> > 8.51)'::geometry, 4979)); st_asewkt
> > -------------------------------------------------------------------------
> > SRID=4979;POINT(0.121584703519227 52.20646902224667 54.461915505876696)
> > (1 row)
> > 
> > I guess 3.0 reduced what was included by default?
> 
> No, this is very much a proj and packaging thing. We just call the API.
> As modern proj got better at grid shifts and finding the best transform chains, the \
> proj team started collecting more grids. Eventually the grid collection got so \
> large that distributing it as one unitary package stopped seeming reasonable. So \
> network/cdn access was adopted, but as a result a "bare" distribution now includes \
> zero grids, whereas before it was common for a packaged proj to at least include \
> grids for the "more common" transforms. 
> P.
> 
> 
> > 
> > James
> > _______________________________________________
> > postgis-users mailing list
> > postgis-users@lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/postgis-users
> 
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