Editing Geodetic Reference System 1980 (section)

{{Short description|Collection of data on Earth's gravity and shape}}
{{More citations needed|date=February 2009}}
{{Geodesy}}
The '''Geodetic Reference System 1980''' ('''GRS80''') consists of a global [[reference ellipsoid]] and a [[normal gravity]] model.<ref name=Moritz1980>{{cite journal |last=Moritz |first=Helmut |authorlink=Helmut Moritz |title=Geodetic Reference System 1980 |journal=[[Bulletin Géodésique]] |volume=54 |issue=3 |date=September 1980 |pages=395–405 |doi=10.1007/BF02521480 |bibcode=1980BGeod..54..395M |s2cid=198209711 |url=http://geoweb.mit.edu/~tah/12.221_2005/grs80_corr.pdf}}</ref><ref name="Moritz1992">{{cite journal | last=Moritz | first=H. |authorlink=Helmut Moritz | title=Geodetic Reference System 1980 | journal=Bulletin Géodésique | publisher=Springer Science and Business Media LLC | volume=66 | issue=2 | year=1992 | issn=0007-4632 | doi=10.1007/bf00989270 | pages=187–192| bibcode=1992BGeod..66..187M | s2cid=122916060 }}</ref><ref name=Moritz2000>{{cite journal |last=Moritz |first=Helmut |authorlink=Helmut Moritz |date=March 2000 |title=Geodetic Reference System 1980 |journal=Journal of Geodesy |volume=74 |issue=1 |pages=128–162 |doi=10.1007/S001900050278 |s2cid=195290884 |url=https://geodesy.geology.ohio-state.edu/course/refpapers/00740128.pdf |access-date=2018-12-15 |archive-date=2016-02-20 |archive-url=https://web.archive.org/web/20160220054607/https://geodesy.geology.ohio-state.edu/course/refpapers/00740128.pdf |url-status=dead }}</ref> The GRS80 gravity model has been followed by the newer more accurate [[Earth Gravitational Model]]s, but the '''GRS80 reference ellipsoid''' is still the most accurate in use for [[coordinate reference system]]s, e.g. for the international [[International Terrestrial Reference System and Frame|ITRS]], the European [[European Terrestrial Reference System 1989|ETRS89]] and (with a 0,1 mm rounding error) for [[World Geodetic System|WGS 84]] used for the American [[Satellite navigation|Global Navigation Satellite System]] ([[Global Positioning System|GPS]]).