Editing World Geodetic System (section)

==Updates and new standards==
The original standardization document for WGS 84 was Technical Report 8350.2, published in September 1987 by the Defense Mapping Agency (which later became the National Imagery and Mapping Agency). New editions were published in September 1991 and July 1997; the latter edition was amended twice, in January 2000 and June 2004.<ref>{{cite web | title = DMA TR 8350.2 WGS | website = IHS Markit Standards Store | url = https://global.ihs.com/doc_detail.cfm?&item_s_key=00135849#doc-detail-history-anchor | access-date = 26 December 2022}}</ref> The standardization document was revised again and published in July 2014 by the [[National Geospatial-Intelligence Agency]] as NGA.STND.0036.<ref>{{cite web |title=Data collection of WGS 84 information — or is it? |url=https://www.gpsworld.com/data-collection-of-wgs-84-information-or-is-it/ |website=GPS World |date=2 November 2016}}</ref> These updates provide refined descriptions of the Earth and realizations of the system for higher precision.

The original WGS84 model had an absolute accuracy of 1–2 meters. WGS84 (G730) first incorporated GPS observations, taking the accuracy down to 10 cm/component rms.<ref name="Standard 0036">{{Cite report |url=https://earth-info.nga.mil/php/download.php?file=coord-wgs84 |title=Department of Defense World Geodetic System 1984 - NGA.STND.0036_1.0.0_WGS84}}</ref> All following revisions including WGS84 (G873) and WGS84 (G1150) also used GPS.<ref>{{Cite web |title=Modern Geocentric Datum {{!}} GEOG 862: GPS and GNSS for Geospatial Professionals |url=https://www.e-education.psu.edu/geog862/node/1801 |access-date=31 December 2023 |website=www.e-education.psu.edu}}</ref>

WGS 84 (G1762) is the sixth update to the WGS reference frame.<ref name="Standard 0036" />

WGS 84 has most recently been updated to use the reference frame '''G2296''', which was released on 7 January 2024 as an update to G2139, now aligned to both the ITRF2020, the most recent ITRF realization, and the IGS20, the frame used by the International GNSS Service (IGS).<ref>{{Cite web| title = Global Navigation Satellite System (GNSS)| work = Office of Geomantics| access-date = 20 January 2024| date = January 2024| url = https://earth-info.nga.mil/index.php?dir=gnss&action=gnss}}</ref> G2139 was aligned with the IGb14 realization of the [[International Terrestrial Reference Frame]] (ITRF) 2014 and uses the new [[International GNSS Service|IGS]] Antex standard.<ref>{{Cite web |author=Australian Government - Geoscience Australia |date=20 March 2017 |title=What are the limitations of using World Geodetic System 1984 in Australia? |url=https://www.ga.gov.au/scientific-topics/positioning-navigation/wgs84 |access-date=16 May 2022 |website=www.ga.gov.au |language=EN}}</ref> 

Updates to the original [[geoid]] for WGS&nbsp;84 are now published as a separate [[Earth Gravitational Model]] (EGM), with improved resolution and accuracy. Likewise, the [[World Magnetic Model]] (WMM) is updated separately. The current version of WGS&nbsp;84 uses EGM2008 and WMM2020.<ref>{{Cite web|url=http://earth-info.nga.mil/GandG/update/index.php?dir=wgs84&action=wgs84#tab_egm2008|title=NGA Geomatics - WGS 84|website=earth-info.nga.mil|access-date=19 March 2019}}</ref><ref>{{Cite web|url=https://www.ncei.noaa.gov/products/world-magnetic-model|title=World Magnetic Model|website=NCEI|access-date=23 January 2020}}</ref>

Solution for Earth orientation parameters consistent with ITRF2014 is also needed (IERS EOP 14C04).<ref>{{Cite web |title=Evolution of the World Geodetic System 1984 (WGS 84) Terrestrial Reference Frame |url=https://www.unoosa.org/documents/pdf/icg/2018/icg13/wgd/wgd_12.pdf |access-date=15 January 2023}}</ref>