Javier,
nothing comes to mind but trying proj_as_proj_string() on them, but that
will be quite slow if you want to filter the whole list of CRS and do
that on every CRS. That said, you could pick up one CRS for each of the
value of projection_method_name to limit the number of CRS instantiation.
Or add a new C function based on using one of
osgeo::proj::operation::getMapping() from
src/iso19111/operation/parammappings.hpp
Even
Le 26/02/2026 à 11:29, Javier Jimenez Shaw via PROJ a écrit :
Hi
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.
We are using "proj_get_crs_info_list_from_database" to get the list of
all the systems (13722). It includes the field
"projection_method_name" (a string).
Is there any function in C or C++ API to know if such a method is
implemented? Doing a quick search in spatialreference I see there are
53 methods in total nowadays.
I don't want to hardcode that list in my code, in case anything
changes in the future.
Thank you.
Cheers
Javier.
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