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== Versions ==
The ITRF realizations developed from the ITRS since
{|class = wikitable
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![[EPSG]]<br />code
! Notes
!ITRF91
|1988.0
|4913
7903
8991
|-
! ITRF92
| 1988.0
| 4914
7904
8992
| First realization of the ITRS
|-
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| 1988.0
| 4915
7905
▲|
8993
|-
! ITRF94
| 1993.0
| 4916
7906
▲|
8994
|-
! ITRF96
| 1997.0
| 4917
7907
▲|
8995
|
|-
! ITRF97
| 1997.0
| 4918
7908
▲|
8996
|
|-
! ITRF2000
| 1997.0
| 4919
7909
8997
| First solution that combines unconstrained space geodesy solutions free from any [[tectonic plate motion model]]<ref>{{cite journal |last1=Altamimi |first1=Zuheir |last2=Sillard |first2=Patrick |last3=Boucher |first3=Claude |title=ITRF2000: A new release of the International Terrestrial Reference Frame for earth science applications |journal=Journal of Geophysical Research: Solid Earth |volume=107 |number=B10 |doi=10.1029/2001JB000561 |pages=ETG 2-1–ETG 2-19 |year=2002|bibcode=2002JGRB..107.2214A }}
</ref>
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| 2000.0
| 4896
7910
| Constructed with input data under the form of time series of station positions and Earth Orientation Parameters.<ref name=paper05>{{cite journal |last1=Altamimi |first1=Z. |last2=Collilieux |first2=X. |last3=Legrand |first3=J. |last4=Garayt |first4=B. |last5=Boucher |first5=C. |title=ITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters |journal=Journal of Geophysical Research: Solid Earth |volume=112 |pages=B09401 |number=B9 |doi=10.1029/2007JB004949 |year=2007|bibcode=2007JGRB..112.9401A |hdl=10338.dmlcz/141752 |hdl-access=free }}</ref>▼
8998
▲| Constructed with input data under the form of time series of station positions and Earth Orientation Parameters.<ref name="paper05">{{cite journal |last1=Altamimi |first1=Z. |last2=Collilieux |first2=X. |last3=Legrand |first3=J. |last4=Garayt |first4=B. |last5=Boucher |first5=C. |title=ITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters |journal=Journal of Geophysical Research: Solid Earth |volume=112 |pages=B09401 |number=B9 |doi=10.1029/2007JB004949 |year=2007|bibcode=2007JGRB..112.9401A |hdl=10338.dmlcz/141752 |hdl-access=free }}</ref>
This version introduces extra parameters to describe the year-periodic motion of the stations: {{mvar|A}} (amplitude) and {{mvar|φ}} (phase) per-axis. This sort of seasonal variation has an amplitude of around 1 cm and is attributed to non-tidal loading effects (e.g. the shifting weight of water).
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| 2005.0
| 5332
8999▼
7911
▲8999
| Includes tropospheric modeling and improved solution methods.<ref name="ITRF2014">{{cite journal|last1=Altamimi|first1=Zuheir|last2=Collilieux|first2=Xavier|last3=Métivier|first3=Laurent|title=ITRF2008: an improved solution of the international terrestrial reference frame|journal=Journal of Geodesy|date=3 February 2011|volume=85|issue=8|pages=457–473|doi=10.1007/s00190-011-0444-4|bibcode=2011JGeod..85..457A|doi-access=free}}</ref>
|-
! ITRF2014
| 2010.0
| 7789
7912 9000 | Generated with an enhanced modeling of nonlinear station motions.<ref>{{Cite journal |last1=Altamimi |first1=Zuheir |last2=Rebischung |first2=Paul |last3=Métivier |first3=Laurent |last4=Collilieux |first4=Xavier |title=ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions |journal = Journal of Geophysical Research: Solid Earth |volume=121 |number=8 |doi=10.1002/2016JB013098 |pages=6109–6131 |year=2016|bibcode=2016JGRB..121.6109A |doi-access=free }}</ref> Specifically:
* a semiannual component is added to the traditional annual periodic model;
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|9988
9989
9990
|<ref>{{Cite web |title=ITRF {{!}} Itrf2020 |url=https://itrf.ign.fr/en/solutions/ITRF2020 |access-date=2022-06-18 |website=itrf.ign.fr}}</ref>
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