[Qgis-user] Lat Lon Tools question

[C Hamilton]

Those are great suggestions. I have put this on my to-do list, but given
that I have a number of tasks already that I need to accomplish, it may be
a few weeks before I will be able to work on it.

On Mon, Feb 8, 2021 at 12:56 PM chris hermansen <clhermansen at gmail.com>
wrote:

> Calvin and list,
>
> On Mon, Feb 8, 2021 at 6:35 AM C Hamilton <adenaculture at gmail.com> 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.
>>
>>
> A suggestion, yes.
>
> This site https://www.maptools.com/tutorials/utm/quick_guide doesn't make
> it completely obvious that they are talking about MGRS.  Moreover it makes
> demonstrably false claims like
>
> The 10S is the Grid Zone Designation you are in. *The Grid Zone is
>> necessary to make the coordinates unique over the entire globe*. (my
>> emphasis here).
>>
> This site https://www.spatialreference.org/ref/epsg/wgs-84-utm-zone-10s/
> makes the use of N and S as zones north of the equator and zones south of
> the equator completely clear, but doesn't mention MGRS.
>
> Not to mention the Wikipedia article quoted awhile back in this
> conversation, which refers to both in an unclear fashion.
>
> So my suggestion to you is that you make it clear that you are referring
> to UTM Zones as described by the spatialreference.org site and not UTM
> Grid Zone Designations (or MGRS if you like) as described by maptools.com.
> You may even want to be explicit in saying that there are only N and S
> designators in UTM Zones and they refer to metres north of the equator vs
> metres north of the -80th parallel.
>
> You could call the version you have right now "UTM Zones" and the version
> you might develop "UTM Grid Zone Designations".  Or maybe the latter as
> "UTM MGRS".
>
>
> --
> Chris Hermansen · clhermansen "at" gmail "dot" com
>
> C'est ma façon de parler.
>
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