<html><head><style type="text/css">.style1 {font-family: "Times New Roman";}</style></head><body><div dir="ltr">All,<div><br></div><div>I've cleaned up the code I have as best I can. I removed all the code specific to our codebase and tried to remove a lot of extraneous settings. This will still require that the user set a few environment variables that will be specific to their system. Hopefully the comments I added make it clear what path folders are required on your system.</div><div><br></div><div>Even sent me the following link: <a href="https://github.com/OSGeo/PROJ/pull/3510">https://github.com/OSGeo/PROJ/pull/3510</a>. The following line from this update stuck out to me:</div><div><br></div><div>NAD83 to NAD83(2011) is no longer a null transformation, but actually chains 4 successive NADCON5 grid based transformations<br></div><div><br></div><div>To me, this suggests that most NAD83 realization transformations were not implemented until at least Proj4 9.2.0. It does seem like some form of the NAD83 1986 to NAD83 HARN realization transformation was implemented prior to this through the HPGN files in the
proj-datumgrid package. But, I suspect this implementation is inferior to the implementation after Proj4 9.2.0.</div><div><br></div><div>So, I suspect Greg is on the right track when he told us to upgrade to the latest version of Proj4. I'm still not clear which min version of GDAL would is necessary for compatibility with Proj4 9.2.0+. If anyone knows off the top of their head, please let me know.</div><div><br></div><div>But, I can do some research on this as well,</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 15, 2024 at 1:30 PM David Klaus <<a href="mailto:dklaus@carlsonsw.com">dklaus@carlsonsw.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"><div dir="ltr">All,<div><br></div><div>If I understand correctly. Before we do anything else, we should try to rebuilt our GDAL solution such that it uses at least Proj4 9.2.0, do I have that right? Does anyone happen to know the minimum GDAL version compatible with Proj4 9.2.0? </div><div><br></div><div>P.S. I am still working on the code example to repeat the issue I ran into.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 15, 2024 at 1:03 PM 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>
> Thank you for the input. You don't happen to know where I can find<br>
> documentation on these NADCON5 related changes?<br>
<br>
I would suggest reading the 9.2.0 release notes.<br>
There is a link to a merged PR which has further discussion.<br>
<br>
The tl;dr; is that proj matches NGS tools. Which is a pretty stunning<br>
result.<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>
</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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