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

[Even Rouault]

Support for US datum transformations has been vastly improved in PROJ 
9.2.0 with NADCON5 grid based transformations

Le 15/07/2024 à 17:46, David Klaus via gdal-dev a écrit :
> 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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