[PROJ] Finding not implemented projections

[Thomas Knudsen]

The west oriented LCC has been used in Denmark, Iceland and perhaps also
Greenland,
cf
https://krigsvidenskab.dk/application/files/1816/1530/1487/Skaermbillede_2021-03-09_kl._15.50.52.png

For the Danish cases, recent compatibility reimplementations, EPSG:10258
and EPSG:10262,
formalizes existing practice, switching to east oriented by multiplying the
westing coordinate by -1

/Thomas

Den tors. 26. feb. 2026 kl. 11.29 skrev Javier Jimenez Shaw via PROJ <
proj at lists.osgeo.org>:

> 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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