[PROJ] Syntax to change projection from UTM to TM

[Ulises Ibarra]

El vie, 6 dic 2024 a las 17:59, Greg Troxel via PROJ (<proj at lists.osgeo.org>)
escribió:

> Ulises Ibarra via PROJ <proj at lists.osgeo.org> writes:
>
> > echo 480037.249 2143783.696 2271.294 | cct +proj=pipeline +step +inv
> > +proj=utm +zone=14 +ellps=GRS80 +k=0.9996439573 +step +proj=tmerc
> > +lat_0=19.388187333 +lon_0=-99.190762728 +x_0=479969.231 +y_0=2143791.499
> > +ellps=GRS80 +k=1
>
> I am far from an expert here, but "UTM zone 14" defines everything about
> the projection, so I don't understand why you are needing to specify the
> k.  Also sort of the ellipse, but people use UTM with both NAD83 and
> WGS84, and you are using it with ITRF2008.
>

* I need to specify in detail because I think I have no idea what I'm doing
:P.
* So I understand that the k is not necessary to use in the command. Is
this correct?
* I don't understand what you said about there being people who use both
NAD83 and WGS84 and I am using  ITRF2008, could you explain it better?
Maybe I shouldn't specify the ellipsoid?

>
> https://www.oc.nps.edu/oc2902w/maps/utmups.pdf
>
> may be useful
> _______________________________________________
> PROJ mailing list
> PROJ at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/proj
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20241206/7ca560b2/attachment.htm>