<html><head><style type="text/css">.style1 {font-family: "Times New Roman";}</style></head><body><div dir="ltr">Even,<div><br></div><div>Thank you for the input. You don't happen to know where I can find documentation on these NADCON5 related changes?</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 15, 2024 at 12:30 PM Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Support for US datum transformations has been vastly improved in
PROJ 9.2.0 with NADCON5 grid based transformations<br>
</p>
<div>Le 15/07/2024 à 17:46, David Klaus via
gdal-dev a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">Greg,
<div><br>
</div>
<div>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,</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Jul 15, 2024 at
11:40 AM Greg Troxel <<a href="mailto:gdt@lexort.com" target="_blank">gdt@lexort.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">David
Klaus <<a href="mailto:dklaus@carlsonsw.com" target="_blank">dklaus@carlsonsw.com</a>>
writes:<br>
<br>
> As far as upgrading Proj4; because we build Proj4
statically in our custom<br>
> build, it's not a trivial task to upgrade versions. Also,
I think there<br>
> might be compatibility reasons why we've stuck with 6.3.1
up until now.<br>
><br>
> But if NAD83 realization transformation functionality has
been expanded and<br>
> improved in later versions, it might be worth it for us
to upgrade. I was<br>
> wondering, judging by the contents of the proj-datumgrid
packages I've<br>
> found online, it looks like Proj4 did not support any
NAD83 realization<br>
> transformations besides 1986->HARN before at least
Proj4 7.0.<br>
<br>
I maintain an unrelated (not geo) software package, and there
my<br>
practice is not to engage in debugging old versions. It takes
a lot of<br>
time and in the cases the problem has been resolved already,
it is<br>
entirely not useful (to the project).<br>
<br>
I am not saying NAD83 is better specifically if you udpate. I
really<br>
don't know.<br>
<br>
</blockquote>
</div>
<br clear="all">
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">David Klaus
<div>Carlson Software</div>
</div>
</div>
<br>
<br>
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</blockquote>
<pre cols="72">--
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My software is free, but my time generally not.</pre>
</div>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">David Klaus<div>Carlson Software</div></div></div>
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