[gdal-dev] GDAL 3.7.0 Proj 6.3.1 strange behavior when performing NAD83(EPSG:4152) to NAD83 HARN(EPSG:4269) realization transformation

[David Klaus]

Greg,

Thank you for that information. I will post my example code shortly.
Hopefully there is an obvious mistake in my code that is not related to
Proj4 or GDAL version,

On Mon, Jul 15, 2024 at 11:40 AM Greg Troxel <gdt at lexort.com> wrote:

> David Klaus <dklaus at carlsonsw.com> writes:
>
> > As far as upgrading Proj4; because we build Proj4 statically in our
> custom
> > build, it's not a trivial task to upgrade versions. Also, I think there
> > might be compatibility reasons why we've stuck with 6.3.1 up until now.
> >
> > But if NAD83 realization transformation functionality has been expanded
> and
> > improved in later versions, it might be worth it for us to upgrade. I was
> > wondering, judging by the contents of the proj-datumgrid packages I've
> > found online, it looks like Proj4 did not support any NAD83 realization
> > transformations besides 1986->HARN before at least Proj4 7.0.
>
> I maintain an unrelated (not geo) software package, and there my
> practice is not to engage in debugging old versions.  It takes a lot of
> time and in the cases the problem has been resolved already, it is
> entirely not useful (to the project).
>
> I am not saying NAD83 is better specifically if you udpate.  I really
> don't know.
>
>

-- 
David Klaus
Carlson Software

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