[PROJ] cs2cs options

[Javier Jimenez Shaw]

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.


>
> 2. Is it possible to specify, as an option of cs2cs, a particular
> pipeline of transformations using the codes considered in the
> Geographic Parameter of the EPSG ?
>

Have you looked at cct application, next to cs2cs?
https://proj.org/en/stable/apps/cct.html


> Antonio
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> PROJ at lists.osgeo.org
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>
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