[Qgis-user] Lat Lon Tools question

[Nicolas Cadieux]

Hi,

I have add a  google drive link to the world MGRS. This should help.

https://drive.google.com/file/d/1HeTOUCHrOF4dqLXyebO33nUwioYGnGbI/view?usp=sharing

Nicolas

On 2021-02-08 9:34 a.m., C Hamilton wrote:
> I should have jumped in on this conversation over the weekend 
> especially since I am the author of Lat Lon Tools. but all who 
> responded have properly addressed the problems with UTM and 
> especially with how MGRS got mixed in with UTM and the confusion with 
> N & S. What Lat Lon Tools provides is the standard UTM coordinates 
> without the MGRS latitude bands. I have been considering adding 
> another function that provides the alternative UTM with MGRS latitude 
> bands.
>
> If anyone has any suggestions on the best way to present these two 
> different UTM versions that helps to avoid ambiguity, please let me know.
>
> Thanks,
>
> Calvin
>
> On Sat, Feb 6, 2021 at 2:19 PM Eric Sorensen <e.b.s at me.com 
> <mailto:e.b.s at me.com>> wrote:
>
>     As Greg and others point out, I appear to be using the UTM zone
>     term inappropriately.  My apologies.
>
>     What I am after in my label, is the MGRS flavor that includes the
>     latitude band, and agrees with the image shown in this link;
>
>     https://docs.qgis.org/3.4/en/_images/utm_zones.png
>     <https://docs.qgis.org/3.4/en/_images/utm_zones.png>
>
>     After you folks successfully educated me on this, I came up with
>     the following;
>
>     concat(name, ', ',  mgrs_gzd($Y, $X), ' ', format_number(utm_east(
>     $Y, $X), 0), ' ',  format_number(utm_north( $Y, $X), 0))
>
>     Which gets me a label like this for the point I originally supplied;
>     Park, 13S 384,258 3,974,547
>
>     This is how my Garmin GPS displays coordinates of waypoints (sans
>     the commas), and how someone would input the point into their gps,
>     after I hand them a map I have created in QGIS.  Now to eliminate
>     the commas.
>
>     Thank you all for your input,
>     es
>
>
>>     On Feb 6, 2021, at 11:41 AM, Greg Troxel <gdt at lexort.com
>>     <mailto:gdt at lexort.com>> wrote:
>>
>>
>>     Eric Sorensen <e.b.s at me.com <mailto:e.b.s at me.com>> writes:
>>
>>>      <wpt lat="35.908381976187229" lon="-106.282681999728084">
>>>        <ele>2262.188964999999826</ele>
>>
>>>     The labels appear as expected, except one small problem.  I know
>>>     the points are in UTM zone 13S, yet the label shows zone 13N.
>>>
>>>     Any thoughts on what I am doing wrong.
>>
>>     That latitude is north, and in New Mexico.  Why do you think it's
>>     zone
>>     13S?
>>
>>     <pause to read>
>>
>>     Beware of the confusion between grid zones from MGRS, not technically
>>     part of UTM, and UTM north/south.  See
>>
>>     https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system#Notation
>>     <https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system#Notation>
>>
>>     So it seems the UTM output uses S and N -- which is what I would
>>     expect
>>     for straight UTM without a MGRS flavor.
>>
>>     If you moved north, you could be in 13T, from 40-48 degrees, and not
>>     have this issue, but then you'd have more snow :-)
>>
>
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-- 
Nicolas Cadieux
https://gitlab.com/njacadieux

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