[PROJ] OGRCreateCoordinateTransformation()

[Erixen Cruz]

>
> PROJ4_GRIDS provided a way to specify exactly which geoid file(s) to use.
> Some vertical datums, such as NAVD88, only have a single EPSG code for
> multiple geoids – what’s the replacement for PROJ4_GRIDS in PROJ9?  If I
> could switch to WKT2 strings (not sure that’s really feasible) does it fix
> these problems?
>
>  WKT2 hardly helps for that.


There is one way to get WKT2 to do just this. Here's the start of the
thread about that:
https://lists.osgeo.org/pipermail/proj/2019-December/009142.html. TLDR you
use a BOUNDCRS with an ABRIDGEDTRANSFORMATION. Thanks again, Even, for
pointing us in this direction.

This is not ideal though. Like Even said, this (mis)use of BOUNDCRS doesn't
fit very cleanly in PROJ9 at the moment.

Sincerely, Erixen
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