[PROJ] Finding not implemented projections

[Greg Troxel]

Javier Jimenez Shaw via PROJ <proj at lists.osgeo.org> writes:

> Today I met "by accident" EPSG:3053
> https://spatialreference.org/ref/epsg/3053/
> looking for a westing-northing system.
>
> I realized that the projection "Lambert Conic Conformal (West Orientated)"
> is not implemented (all fine, I don't want it to be implemented).
>
> What I want to know is which CRSs from the catalog do not have an
> implemented projection, to avoid using them.

Not quite what you asked, but another question is

  which CRSs from the catalog cannot be transformed to [some common
  CRS, perhaps ITRF2020 at its reference epoch]?

and you could perhaps iterate over the list of CRSs and ask for a
pipeline from that to the common CRS, and see which ones lead to an
answer, and which don't.