Talk:Military Grid Reference System: Difference between revisions

Revision as of 19:42, 26 October 2016

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==Comments==

This needs to be categorized.

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== Georef? ==

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I've been researching MGRS for a few days, but the above is totally opaque to me. Does this have something to do with the fact that locations that border GZJs are canonicalized by some software libraries (e.g. 17SKT --> 16SGB5807198790)? We should clarify the above with an example. [[User:Ericbg05|Ericbg05]] ([[User talk:Ericbg05|talk]]) 13:39, 10 June 2014 (UTC)

:It's talking about how some squares like 18N SF don't have a 0,0, easting,northing as the southwest corner is outside of the zone. It's because of UTM. The squares are square in reference to the equator, and the vertical "central meridian" line in the centre of each zone.<ref>https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system#Locating_a_position_using_UTM_coordinates</ref> In UTM, that line is 500,000 easting. 0 easting doesn't exist, it's in the zone to the west. So in MGRS/USNG, the squares on the edges of zones are clipped, but the squares on the west side still use the soutwest corner for 0,0 easting,northing, even though that's a possibly invalid point. I might try to clear up the article, but I want to do more work with USNG/MGRS first to ensure my understanding is correct. [[User:Mtfurlan|Mtfurlan]] ([[User talk:Mtfurlan|talk]]) 16:32, 27 October 2016 (UTC)

== Figure 1 lat/lng doesn't match up with MGRS? ==

So each latitude band is 8 degrees, right? Look at figure 1. It doesn't quite match. http://nationalgrid.s3.amazonaws.com/webmercator/index.html shows it matching properly, (a least up to 40 degrees) so can someone else confirm I'm not crazy and that figure 1 is wrong?

{{reflist-talk}}

[[User:Mtfurlan|Mtfurlan]] ([[User talk:Mtfurlan|talk]]) 19:40, 26 October 2016 (UTC)

== Also referred to as "NATO UTM" ==

Referenced by [http://www.rcn.montana.edu/resources/converter.aspx this converter], where the coordinates match the lat/lng to MGRS conversion done by [http://www.movable-type.co.uk/scripts/latlong-utm-mgrs.html a different converter].

[https://books.google.com/books?id=SkSgBgAAQBAJ&pg=PT112&lpg=PT112&dq=%22NATO+UTM%22&source=bl&ots=vbPIHZ_Uto&sig=KGxt6yT8nRGVVS7pknC0iOXji1g&hl=en&sa=X&ved=0ahUKEwiroKjjqvvPAhUI6oMKHYb5A54Q6AEISTAG#v=onepage&q=%22NATO%20UTM%22&f=false This book] also references it, but I'm not buying the book to look at the books reference.

I'm not going to edit the actual article without a better reference than a google books link to a book whose sources I can't check.

[[User:Mtfurlan|Mtfurlan]] ([[User talk:Mtfurlan|talk]]) 1916:4019, 2627 October 2016 (UTC)

== How coordinates of the joint of grid zone was made? ==

I don't know why some zone starting with zero numbers and some zone starting with the numbers 6 (starting point). [[Special:Contributions/27.109.113.245|27.109.113.245]] ([[User talk:27.109.113.245|talk]]) 08:55, 20 May 2023 (UTC)