Why +k=0.9996439573 for UTM? It should be 0.9996, right? On Fri, 6 Dec 2024, 21:29 Ulises Ibarra via PROJ, <proj@lists.osgeo.org> wrote:
> Hello, I would like you to please guide me with my following couple of > questions: > > I have a list of coordinates in a UTM Zone 14 North projection, in the > ITRF2008 datum, I would like to change them to a Transverse Mercator > projection, in which the central meridian lon_0 coincides in longitude with > one of the points on my list, point 1: UTM(1, East=479969.231, > North=2143791.499, Elevation=2274.949) and or in geographic coordinates (1, > lat=19.388187333, lon=-99.190762728, Elevation=2274.949) > > Question: Would it be correct to use the following syntax and parameters? > Because I am not getting the expected result.: > > 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 get the output: 480037.2841 2143783.7685 2271.2940 inf > > The correct result should be: 480037.3001 2143783.6901 2271.294 > > Best regards > > Ulises > _______________________________________________ > PROJ mailing list > PROJ@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/proj >
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