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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.

See the following IERS web pages for more information:

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