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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)
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)
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
Coordinates from the mapping system can sometimes be roughly changed into another datum using a simple translation. For example, to convert from ETRF89 (GPS) to the Irish Grid add 49 meters to the east, and subtract 23.4 meters s from the north.[7] More generally one datum is changed into any other datum using a process called Helmert transformations.
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)
The first sentence is a little confusing about the relationship to spherical coordinate systems:
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)
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:
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: /info/en/?search=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)
Strebe ( talk) 03:14, 31 August 2020 (UTC)The Earth-centered Earth-fixed (also known as the ECEF, ECF, or conventional terrestrial coordinate system) rotates with the Earth and has its origin at the center of the Earth.
The name of this page can be confusing, as the specific term GCS is commonly used only for the spherical (lat/lon) coordinates, as opposed to planar or projected coordinate systems (e.g., in ArcGIS and some textbooks). The generic term is just "coordinate system" in geography, so perhaps it should be Coordinate System (Geography), with a section or separate page focusing on GCS (lat/lon). That said, I've always thought such a co-option of the generic term GCS for one type is unfortunate, but it is not my decision. Maybe we should just follow the crowd and start calling lat/lon "GPS coordinates" ;-) Bplewe ( talk) 16:01, 22 November 2021 (UTC)
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)
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)
One often sees e.g. +/-Y° and +/-X° instead of °N/S and °E/W. If there are one or more standards for this, I think it might be helpful to discuss this topic on the page. 142.92.29.46 ( talk) 19:05, 12 February 2024 (UTC)
This is the
talk page for discussing improvements to the
Geographic coordinate system article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
Archives: 1Auto-archiving period: 365 days |
This article is written in American English, which has its own spelling conventions (color, defense, traveled) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus. |
This
level-4 vital article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||||||||||||||||||||||||||||||
|
Text and/or other creative content from this version of Geographic coordinate system was copied or moved into Vertical datum. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. |
This page has archives. Sections older than 365 days may be automatically archived by Lowercase sigmabot III when more than 10 sections are present. |
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)
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)
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
Coordinates from the mapping system can sometimes be roughly changed into another datum using a simple translation. For example, to convert from ETRF89 (GPS) to the Irish Grid add 49 meters to the east, and subtract 23.4 meters s from the north.[7] More generally one datum is changed into any other datum using a process called Helmert transformations.
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)
The first sentence is a little confusing about the relationship to spherical coordinate systems:
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)
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:
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: /info/en/?search=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)
Strebe ( talk) 03:14, 31 August 2020 (UTC)The Earth-centered Earth-fixed (also known as the ECEF, ECF, or conventional terrestrial coordinate system) rotates with the Earth and has its origin at the center of the Earth.
The name of this page can be confusing, as the specific term GCS is commonly used only for the spherical (lat/lon) coordinates, as opposed to planar or projected coordinate systems (e.g., in ArcGIS and some textbooks). The generic term is just "coordinate system" in geography, so perhaps it should be Coordinate System (Geography), with a section or separate page focusing on GCS (lat/lon). That said, I've always thought such a co-option of the generic term GCS for one type is unfortunate, but it is not my decision. Maybe we should just follow the crowd and start calling lat/lon "GPS coordinates" ;-) Bplewe ( talk) 16:01, 22 November 2021 (UTC)
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)
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)
One often sees e.g. +/-Y° and +/-X° instead of °N/S and °E/W. If there are one or more standards for this, I think it might be helpful to discuss this topic on the page. 142.92.29.46 ( talk) 19:05, 12 February 2024 (UTC)