[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]

Even,

Thank you for the input. You don't happen to know where I can find
documentation on these NADCON5 related changes?

On Mon, Jul 15, 2024 at 12:30 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> 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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>

-- 
David Klaus
Carlson Software

Disclaimer

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