Talk:Geographic coordinate system

message: The DAB page Graticule says the term only applies to the Geographic coordinate system. Why doesn't it also apply to Geodetic coordinate system, or any other map coordinate system? SharkD  ☎  20:56, 10 August 2018 (UTC)
replies: text: Are you suggesting that a geodetic coordinate system is not a geographic coordinate system? “Graticule” specifically does not apply to the rectangular grid systems imposed on top of a map. Strebe (talk) 22:02, 10 August 2018 (UTC)
thread_title:  Graticule 

message: I conclude the article uses British spelling based on the word "metre" being introduced on 27 October 2017. Jc3s5h (talk) 12:11, 3 May 2019 (UTC)
replies: text: There was no edit on October 27, 2017, and in any case, the article was written in 2002 in US English (“center”; no mention of “meter/metre”), not in 2017. Usage has been incorrectly mixed at odd intervals since. Strebe (talk) 16:36, 3 May 2019 (UTC)
thread_title: Spelling

message: I've edited the Geodetic datum section to try and make it clearer. It's my first Wikipedia edit, so apologies if I have gone about this the wrong way - please feel free to revert. 
Specifically, I wanted to try and improve the following text
* There is a link to "translation" in the linguistic sense, rather than the geometric one, which I assume is a mistake
* A reader could assume that you can add meters to an ETRF89 latitude and longitude. The original source [7] makes clear that there is first a transverse Mercator projection using Irish Grid parameters to turn the lat/lon into Eastings and Northings (which you can add metres to), but that context is lost here.
* The phrase "ETRF89 (GPS)" could give the impression that GPS is based on ETRF89. The original source [7] uses the parenthetical reference to indicate locations that were derived from a GPS receiver, but this context is lost here.
For me, the key point of the paragraph is to indicate that your "local" datum might not be the one used by your GPS receiver, and you may need to do a datum transformation, which might be a trivial translation but probably isn't. I have attempt to edit it to keep this intent while addressing the issues above. I felt some of the detail (the number of metres you add to an Irish Grid northing, how many parameters there are in a Helmert transformation) was unnecessary for the purposes of understanding what a datum is, so I trimmed it out.
I hope this is an improvement and that I've gone about this the right way. Please correct and educate me if not!
--Mcanterb (talk) 08:39, 4 July 2019 (UTC)
thread_title:  Clarifications to Geodetic Datum section 

message: The first sentence is a little confusing about the relationship to spherical coordinate systems:
: A geographic coordinate system is a coordinate system that enables every location on Earth to be specified in three coordinates, using mainly a spherical coordinate system.
What does "mainly" mean here? The article on Spherical coordinate system says that a geographic coordinate system is different than a spherical one. -Pgan002 (talk) 13:57, 19 October 2019 (UTC)
thread_title:  Intro sentence - spherical coordinates 

message: I see a bit too many reverts, which I suggest end. There are some useful and unuseful bits, so I don't want to add add another revert. Here are a few notes:
* Use of en dash for "west–east" is correct (MOS:ENDASH), so keep these edits.
* There is no primary English variation for this article. Not sure what's best: use all US English, use all British English, or mixed, as this is a globally-focused article. I think it is OK to have it mixed in context, as it was before. So use British English for "but neighbouring Scotland" and American English for "cartographical organization include the North American Datum". More on this MOS:ENGVAR.
:+mt 21:00, 25 March 2020 (UTC)
replies: text: The top of the talk page contains a US English template. Presumably the UK spelling snuck in after the template was added.Jc3s5h (talk) 21:24, 25 March 2020 (UTC)
replies: text: Thanks, I normally look for  on the main article, but I see this now on the Talk page. This is fine with me. +mt 23:27, 25 March 2020 (UTC)
thread_title:  Too many reverts 

message: The figure with the caption "Earth centered, Earth fixed coordinates in relation to latitude and longitude" is wrong -- since this is for an ellipsoid, the radius vector $r$ should not pass through the center of mass of the ellipsoid. See here: https://en.wikipedia.org/wiki/Geographic_coordinate_conversion#/media/File:Geodetic_latitude_and_the_length_of_Normal.svg  — Preceding unsigned comment added by 205.204.46.102 (talk) 01:45, 30 August 2020 (UTC)
replies: text: The diagram is for ECEF, which is not geodetic coordinates. As stated in the article,  Strebe (talk) 03:14, 31 August 2020 (UTC)
thread_title:  Figure is wrong 

message: Since there was no objection to my proposal, I have refocused this page with respect to Spatial reference system, Grid reference system, and Earth-centered, Earth-fixed coordinate system, so that this page focuses specifically on latitude/longitude, which is how the term is used in the international standards mentioned above. It could still use some improvement, though. Bplewe (talk) 02:44, 18 December 2021 (UTC)
thread_title: Refocused

message: What is meant by geographic coordinate system?who introduced it? 2405:EC01:1001:2B61:FEF:BAB5:6097:67FC (talk) 04:52, 12 June 2022 (UTC)
replies: text: @2405:EC01:1001:2B61:FEF:BAB5:6097:67FC its a worldwide corrdinates and idk either who introduced it 2601:680:8300:3870:ACD0:3995:CC1D:3CEF (talk) 05:28, 25 January 2024 (UTC)
thread_title:  Geography