[PROJ] Implementation of NADCON5 transformations for USA

[Greg Troxel]

Even Rouault <even.rouault at spatialys.com> writes:

> I just wanted to point to https://github.com/OSGeo/PROJ/pull/3510
> which implements the NADCON5 transformations, with a corresponding
> pull request to PROJ-data to add  the grids as GeoTIFF files, for USA
> geodetic datums NAD27 --> NAD83(86) --> NAD83(HARN) --> NAD83(FBN) --> 
> NAD83(NSRS2007) --> NAD83(2011). We can now reproduce exactly the
> results of NGS tools, such as NCAT and their online REST API.
>
> This means that the transformations within the NAD83 family which used
> to be mostly null transformations (except NAD83(86)->NAD83(HARN) where
> we currently use the HPGN grids) are no longer null. This might change
> results in your workflows once this is merged, but this is hopefully
> for the good...

Wow, this is amazing to see.   I think it is definitely for the good!

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