[PROJ] Syntax to change projection from UTM to TM

[Ulises Ibarra]

El vie, 6 de dic de 2024, 2:50 p. m., Ulises Ibarra <
ulisesmartinibarra at gmail.com> escribió:

> I put it like this because the GNSS point processing report shows that
> precision:
>
> *ID*
>
>
> *Este (Metro)*
>
>
> *Norte (Metro)*
>
>
> *Elevación (Metro)*
>
> *Código de característica*
>
> *Factor de escala de proyección*
>
> *Factor de escala de altura*
>
> *Factor de escala combinada*
>
> *Ángulo de convergencia de meridiano*
>
> 1
> <http://localhost:62166/?Project=517934e2-64fe-458c-8f31-01d1e5466692&SerialNumber=1225>
>
> 479969.231
>
> 2143791.499
>
> 2274.949
>
>
> 0.9996049594
>
> 0.9996433833
>
> 0.9992484835
>
> -0°03'48"
>
> 2
> <http://localhost:62166/?Project=517934e2-64fe-458c-8f31-01d1e5466692&SerialNumber=1221>
>
> 480037.249
>
> 2143783.696
>
> 2271.294
>
> vert
>
> 0.9996049258
>
> 0.9996439573
>
> 0.9992490237
>
> -0°03'47"
>
> ICMX
> <http://localhost:62166/?Project=517934e2-64fe-458c-8f31-01d1e5466692&SerialNumber=1246>
>
> 482061.740
>
> 2145720.665
>
> 2272.977
>
>
> 0.9996039773
>
> 0.9996436929
>
> 0.9992478113
>
> -0°03'24"
>
> El vie, 6 dic 2024 a las 14:41, Javier Jimenez Shaw (<j1 at jimenezshaw.com>)
> escribió:
>
>> Why +k=0.9996439573 for UTM?
>> It should be 0.9996, right?
>>
>> On Fri, 6 Dec 2024, 21:29 Ulises Ibarra via PROJ, <proj at 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 at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/proj
>>>
>>
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