[PROJ] Finding not implemented projections

[Thomas Knudsen]

No, the W-N system is not in general use anymore.

But as national mapping authorities, we are also "custodians of a museum of
legacy geodata".
Hence providing means for forward interoperability is part of the job

Den fre. 27. feb. 2026 kl. 14.30 skrev Javier Jimenez Shaw <
j1 at jimenezshaw.com>:

> Thanks Thomas
>
> Does it mean that the W-N systems are still used? Or is it a relic from
> the past? I found EPSG:3053 because a colleague was looking for something
> with "abnormal" axis order (more than N-E (many), W-S (South Africa) and
> S-W (Czechia))
> In Czechia they also have a "normalized" version that is E-N, to avoid
> problems in software.
>
> On Fri, 27 Feb 2026 at 14:12, Thomas Knudsen <knudsen.thomas at gmail.com>
> wrote:
>
>> 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.
>>> _______________________________________________
>>> PROJ mailing list
>>> PROJ at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/proj
>>>
>>
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