[PROJ] cs2cs options

[Even Rouault]

Le 04/03/2026 à 18:24, Javier Jimenez Shaw a écrit :
> Thanks Even.
>
> But that is not always:
yes, in that case there's only one single pipeline possible (a map 
projection without datum change) as reported by projinfo
>
> echo 40 0 | PROJ_DEBUG=2 ./cs2cs  etrs89 epsg:25830
> pj_open_lib(proj.ini): call fopen(...proj.ini) - succeeded
> pj_open_lib(proj.db): call fopen(...proj.db) - succeeded
> 756099.65 4432069.06 0.00
>
> And I understand (way) better the proj pipeline ;)
>
>
> On Wed, 4 Mar 2026 at 18:12, Even Rouault <even.rouault at spatialys.com> 
> wrote:
>
>
>     Le 04/03/2026 à 18:09, Javier Jimenez Shaw via PROJ a écrit :
>>     Hi Antonio.
>>
>>     On Tue, 3 Mar 2026 at 19:25, Antonio Valanzano via PROJ
>>     <proj at lists.osgeo.org> wrote:
>>
>>         I have used for the first time cs2cs and I have found not easy to
>>         discover which transformation the sw uses for the calculations.
>>
>>         Here are my questions:
>>
>>         1. Is it possible  for cs2cs to output not only the results
>>         but also
>>         the EPSG code of the transformation(s)  used to produce the
>>         output ?
>>         This information could be useful for users in order to have more
>>         control over the transformations and avoid using the sw as a
>>         black
>>         box.
>>
>>
>>     There is projinfo https://proj.org/en/stable/apps/projinfo.html ,
>>     that can give you similar information. But it would be nice to
>>     have an option in cs2cs that prints the last operation used
>>     calling "proj_trans_get_last_used_operation".
>>     That way the user can know "exactly" the operation performed.
>     $ echo 49 15 | PROJ_NETWORK=ON PROJ_DEBUG=2 bin/cs2cs EPSG:4258
>     EPSG:5514+8357 --3d
>     [...]
>     Using coordinate operation ETRS89 to S-JTSK / Krovak East North +
>     Baltic 1957 height
>     [...]
>     -717321.47    -1168433.34 -46.13
>
>     -- 
>     http://www.spatialys.com
>     My software is free, but my time generally not.
>
-- 
http://www.spatialys.com
My software is free, but my time generally not.
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