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The International Terrestrial Reference Frame (ITRF)

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.

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

  • 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
AccuracyUncertainties are given in the solutions.
UpdatesFrom one to several years.
Public access

ITRF92Primary ITRF92 station positions/velocities
ITRF93 Primary ITRF93 station positions/velocities
ITRF94Primary ITRF94 station positions/velocities
ITRF96Primary ITRF96 station positions/velocities
ITRF97Primary ITRF97 station positions/velocities
ITRF2000Primary ITRF2000 station positions/velocities
Local ties used in ITRF2000
ITRF2005ITRF2005 description
ITRF2008ITRF2008 description
ITRF2014ITRF2014 description
ITRF92-ITRF2000simple tables

ITRF homepage

ITRF89IERS Technical Note No. 6
ITRF90IERS Technical Note No. 9
ITRF91IERS Technical Note No. 12
ITRF92IERS Technical Note No. 15
ITRF93IERS Technical Note No. 18
ITRF94IERS Technical Note No. 20
ITRF96IERS Technical Note No. 24
ITRF97IERS Technical Note No. 27
ITRF2000IERS Technical Note No. 31
ITRF2005Z. 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

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


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

IERS NetworkDomes number description
Domes number request
Site information and selection
Map of ITRF2014 network
Recommendations and Standards

IAU and IUGG/IAG recommendations on reference systems

IERS Conventions

ITRF Mailing list
Product CentreIERS ITRS Centre

See the following IERS web pages for more information:

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