[PROJ] transform with external geoid file

[Javier Jimenez Shaw]

Hi

I want to transform coordinates from CRS A to CRS B in C/C++ with PROJ 8.2.0
Usually A and/or B are geographic 3D or compound with the geoid file
included in PROJ-data. So far so good.

However sometimes one or both systems use a geoid file that is not in
PROJ-data. I would like to define de transformation specifying the geoid
file(s), and the interpolation reference system(s). How is the best way to
do it? Assume that the transformation from geographic to vertical is not
defined in proj.db.

Thanks
Javier
.___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
Entre dos pensamientos racionales
hay infinitos pensamientos irracionales.
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