[PROJ] NAD83(2011) to NATRF2022 + NAPGD2022

[Javier Jimenez Shaw]

Hi

I have problems with that particular operation for the Modernized NSRS
NAD83(2011) to NATRF2022 + NAPGD2022

NGS recently published the NADCON5 (or 6) grid files from NAD83(2011) to
NATRF2022
They are in my NSRS-2022-PROJ project.

The changes I am doing are in this branch:
https://github.com/jjimenezshaw/NSRS-2022-PROJ/tree/nad83-to-natrf-napgd

The problem comes from "ITRF2020 to NAD83(2011) (1)" and that NAPGD2022 is
interpolated in ITRF2020.
So PROJ is going from NAD83(2011) to ITRF2020, apply the geoid model, and
then from ITRF2020 to NATRF2022... ignoring the NADCON5 file. That is wrong.

Trying to fix it I made a concatenated operation from "NATRF2022 to
NAPGD2022", but it is not fixing it.
However, if I define explicitly "NATRF2022 to NAPGD2022" (not a
concatenated operation but an entry in the table grid_transformation) it
works.

What is the difference between the explicit transformation and the
concatenated operation?

If you need help to reproduce it, ask me directly. Otherwise this email
would be too long.

Note 1: NAD83(2011) to NATRF2022 (ellipsoidal) is working fine (no surprise)
Note 2: if the transformation is from NAD83(2011)+NAVD88 height, it is
working fine. The problem is apparently only from the 3D system.

Thank you
Javier.
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