[PROJ] Some (probably dumb) questions about cs2cs and projinfo

[Andrea Giudiceandrea]

Il 24/02/2026 13:23, Andrea Giudiceandrea ha scritto:
> Thank you very much, Even. Your explanation clarifies all my doubts!

Actually, not exactly all...

I wonder why In QGIS the listed transformations available for EPSG:23033 
-> EPSG:3065 are only 2 (1 grid, 1 ballpark, corresponding to projinfo 
without "--grid-check discard_missing") instead of the 6 (5 Helmert, 1 
ballpark) listed by projinfo with "--grid-check discard_missing" or a 
union of both (1 grid shift, 5 Helmert and 1 ballpark).

This creates a discrepancy, making QGIS use a ballpark transformation 
whereas a better one could be used.

Maybe it would be useful if QGIS could list and let the user choose 
among all the available transformations, wouldn't it?

Regards.

Andrea