[PROJ] WGS84 to GDA94 and GDA2020

[Kristian Evers]

Hi Nigel

Welcome to the list :-)

First of all I think you are being way too unrealistic about what you can
use ChatGPT for. If you'd tried the command it's suggested to you, you
would know that it doesn't work. It has given you an ill-formed CRS, as
well as suggesting you use deprecated syntax.

It would be helpful if you can be more explicit about what you are trying
to do. What EPSG-codes are you trying to get a transformation between?

/Kristian

On Fri, 11 Oct 2024 at 09:36, Nigel Stewart via PROJ <proj at lists.osgeo.org>
wrote:

>
> Hello all, first time posting to this list.
>
> We've come across something a bit disconcerting using PROJ. To and from
> GDA94 and GDA2020 (Australia) PROJ is using Helmert step, but from a
> WGS84-based transverse mercator the Helmert is not used and the coordinates
> are exactly the same for both EPSG:28356 (GDA94) and EPSG:7856 (GDA2020).
> ChatGPT has something to say about telling PROJ about EPSG:8048 for the
> Helmert transformation. Are we being unrealistic about just expecting it to
> work without forming our own pipeline for this particular case? Or does
> this seem like some sort of corner case that PROJ could implement in
> future? Any perspective or guidance appreciated.
>
> The ChatGPT opinion is along the lines of:
> cs2cs +init=epsg:4326 +to +init=epsg:28356 +step +init=epsg:8048
>
> Thanks,
>
> Nigel Stewart
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> PROJ mailing list
> PROJ at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/proj
>
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