[PROJ] Issue with inverted axis

[Javier Jimenez Shaw]

With *proj_crs_get_coordinate_system* and  *proj_cs_get_axis_info* you can
get the needed info.
See the difference between CRS (coordinate reference system) and CS
(coordinate system).

On Tue, 30 Jul 2024 at 16:10, Mladen Mijatovic <kapadokija at gmail.com> wrote:

> Hi Javier,
>
> I am using a .NET wrapper around the Proj, called SharpProj. I am creating
> crs from a database, using *proj_create_from_database* with authority
> EPSG and coe 2193 as params.  Next thing I try is to convert some positions
> using* proj_create_crs_to_crs_from_pj *with EPSG:2193 as source crs and
> EPSG:4326 as target crs. Next call is to *proj_trans* without forwarding
> and with and with coordinates [-41.302232653193769, 174.77951032151356]
> as lat, lon. The result is an array of 2, converted[0] = 799875.43712394813
> and converted[1] = 400261.41900983331 From this array I need to know what
> to pick as Northing and what as Easting.
>
> уто, 30. јул 2024. у 14:37 Javier Jimenez Shaw <j1 at jimenezshaw.com> је
> написао/ла:
>
>> Hi Mladen,
>>
>> In which context do you want to do that? python? C++? CLI? What are you
>> doing later with that info (like calling cs2cs or anything else)?
>> If you just want to know for a few cases,
>> https://spatialreference.org/ref/epsg/2193/ is an easy reference. There
>> is axis information.
>>
>> Cheers
>>
>> On Tue, 30 Jul 2024 at 14:11, Mladen Mijatovic via PROJ <
>> proj at lists.osgeo.org> wrote:
>>
>>> Hi all,
>>>
>>> Is there a way to identify if crs has an inverted axis? In most of the
>>> cases axes are Lat,Lon or E,N but I stumbled on one with axis N,E -
>>> EPSG:2193. In this case I need to invert coordinates before the
>>> transformation and I am not sure how to identify this situation in general.
>>> _______________________________________________
>>> PROJ mailing list
>>> PROJ at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/proj
>>>
>>
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