On Sat, 7 Dec 2024, 01:10 Ulises Ibarra via PROJ, <proj@lists.osgeo.org> wrote:
> > El vie, 6 dic 2024 a las 17:59, Greg Troxel via PROJ (< > proj@lists.osgeo.org>) escribió: > >> Ulises Ibarra via PROJ <proj@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 > If you explain all the inputs in detail, including those k and why you expect that output, I can try to guess it. The PROJ pipeline I think is correct, except for the values themselves (k, false easting and northing) > . > * 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@lists.osgeo.org >> https://lists.osgeo.org/mailman/listinfo/proj >> > _______________________________________________ > PROJ mailing list > PROJ@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/proj >
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