<div dir="auto">Thanks Even and everybody else involved in this development. It is great news. Another step that makes PROJ a reference in the sector. And it is open source!<div dir="auto"><br></div><div dir="auto">To the users that experience differences, this will be a good time to know/learn the different versions of NAD83... and use the right one ;)</div><div dir="auto"><br></div><div dir="auto">Good work!</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 16 Dec 2022, 04:02 Even Rouault, <<a href="mailto:even.rouault@spatialys.com" target="_blank" rel="noreferrer">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I just wanted to point to <a href="https://github.com/OSGeo/PROJ/pull/3510" rel="noreferrer noreferrer noreferrer" target="_blank">https://github.com/OSGeo/PROJ/pull/3510</a> which <br>
implements the NADCON5 transformations, with a corresponding pull <br>
request to PROJ-data to add the grids as GeoTIFF files, for USA <br>
geodetic datums NAD27 --> NAD83(86) --> NAD83(HARN) --> NAD83(FBN) --> <br>
NAD83(NSRS2007) --> NAD83(2011). We can now reproduce exactly the <br>
results of NGS tools, such as NCAT and their online REST API.<br>
<br>
This means that the transformations within the NAD83 family which used <br>
to be mostly null transformations (except NAD83(86)->NAD83(HARN) where <br>
we currently use the HPGN grids) are no longer null. This might change <br>
results in your workflows once this is merged, but this is hopefully for <br>
the good...<br>
<br>
Even<br>
<br>
-- <br>
<a href="http://www.spatialys.com" rel="noreferrer noreferrer noreferrer" target="_blank">http://www.spatialys.com</a><br>
My software is free, but my time generally not.<br>
<br>
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</blockquote></div>