The International Terrestrial Reference Frame (ITRF) is a set of points with their 3-dimensional cartesian coordinates which realize an ideal reference system, the International Terrestrial Reference System (ITRS), as defined by the IUGG resolution No. 2 adopted in Vienna, 1991 ( IUGG1991 Resolutions (PDF, 105KB, Not barrier-free file.)).

The ITRS Combination Centres provide also alternative realizations of the ITRF.

Contents	cartesian stations coordinates and velocities Earth Orientation Parameters (ITRF2008 only) site catalogue DOMES identification numbers (see "Documentation") local ties (see "Documentation") realizations: ITRF89, ITRF90, ITRF91, ITRF92, ITRF93, ITRF94, ITRF96, ITRF97, ITRF2000, ITRF2005, ITRF2008, ITRF2014, ITRF2020, ITRF2020-u2023, ITRF2020-u2024
Accuracy	Uncertainties are given in the solutions.
Updates	From one to several years.
Public access	http://itrf.fr/ITRF_solutions/index.php or https://datacenter.iers.org/products/reference-systems/terrestrial/itrf/
	ITRF92	Primary ITRF92 station positions/velocities
	ITRF93	Primary ITRF93 station positions/velocities
	ITRF94	Primary ITRF94 station positions/velocities
	ITRF96	Primary ITRF96 station positions/velocities
	ITRF97	Primary ITRF97 station positions/velocities
	ITRF2000	Primary ITRF2000 station positions/velocities
		Local ties used in ITRF2000
	ITRF2005	ITRF2005 description
	ITRF2008	ITRF2008 description
	ITRF2014	ITRF2014 description
	ITRF2020	ITRF2020 description
	ITRF2020-u2023	ITRF2020-u2023 description
	ITRF2020-u2024	ITRF2020-u2024 description
Format	ITRF92-ITRF2000	simple tables
	ITRF94-ITRF2020	SINEX-Format
	ITRF homepage
Documentation	ITRF89	IERS Technical Note No. 6
	ITRF90	IERS Technical Note No. 9
	ITRF91	IERS Technical Note No. 12
	ITRF92	IERS Technical Note No. 15
	ITRF93	IERS Technical Note No. 18
	ITRF94	IERS Technical Note No. 20
	ITRF96	IERS Technical Note No. 24
	ITRF97	IERS Technical Note No. 27
	ITRF2000	IERS Technical Note No. 31
	ITRF2005	Z. Altamimi, X. Collilieux, J. Legrand, B. Garayt, C. Boucher: ITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters, Journal of geophysical research, 2007, DOI: 10.1029/2007JB004949
	ITRF2008	Z. Altamimi, X. Collilieux, L. Métivier: ITRF2008: an improved solution of the international terrestrial reference frame, Journal of geodesy, 2011, DOI: 10.1007/s00190-011-0444-4
		IERS Technical Note No. 37
	ITRF2014	Z. Altamimi, P. Rebischung, L. Métivier, X. Collilieux: ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions, Journal of Geophysical Research: Solid Earth, 2017, DOI: 10.1002/2016JB013098
		IERS Technical Note No. 38
	ITRF2020	Z. Altamimi, P. Rebischung, X. Collilieux, L. Métivier, K. Chanard: ITRF2020: an augmented reference frame refining the modeling of nonlinear station motions, Journal of Geodesy, 2023, DOI:10.1007/s00190-023-01738-w
		IERS Technical Note No. 41
	IERS Network	The DOMES Numbering System
		DOMES number request
		ITRF Site Information and Selection
		Map of ITRF2014 network
		Map of ITRF2020 network
		Map of ITRF2020-u2023 network
		Map of ITRF2020-u2024 network
	Resolutions and Standards	IAU and IUGG/IAG resolutions
		IERS Conventions
Product Centre	IERS ITRS Centre