> On Dec 16, 2022, at 8:03 AM, Greg Troxel <[email protected]> wrote:
>
>
> Even Rouault <[email protected]> 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!
Thank you so much to whomever sponsored this work. This has been a really
important missing workflow piece for US-based activities.
Howard
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