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On-line coordinate transformation between coordinates (position and velocity) expressed in any ETRFxx realisations of the European Terrestrial Reference System (ETRS89) and any ITRFyy realizations of the International Terrestrial Reference System (ITRS).
In case output coordinates are requested at a different epoch then the provided input coordinates, it is mandatory to also input station velocities.

For transformations to and from the Galileo Terrestrial Reference Frame (GTRF), use ITRF. GTRF is aligned to current versions of the ITRF.

Explanation and examples are available from the following tutorial. However, note that with the introduction of the most recent transformation tool (August 2022), this tutorial has become slightly outdated.
If you use the ECTT tool, please cite doi:10.24414/ROB-EUREF-ECTT.

Change epoch format:

Decimal Year: YYYY.DD Year/Doy: YYYY/DDD Year/Month/Day: YYYY-MM-DD GPS week/Day of Week: WWWW/D

Updates of ECTT V2.0

• 12 Apr. 2024: Added transformations from and to ETRF2020.
• 14 Nov. 2022: Correction of last step of transformation from ETRFxx to ITRF2020. Thanks to Theo van Houten from Hydrographic Service of the Royal Netherlands Navy for notifying us of the problem.
• 15 Sep. 2022: Print of epoch with two decimals instead of one.
• 29 Aug. 2022: Release of V2.0 of ETRF/ITRF Coordinate Transformation Tool (ECTT) with reduced intermediate coordinate transformations. V2.0 includes now also transformations from and to ITRF2020.

Updates of ECTT V1.0

• 08 Feb. 2022: Correction of bug affecting the printing of results in transformation from ITRF93/94/96/97 to ETRF2005/2014. Thanks to Benjamin Weyer from CERN for notifying us of this problem.
• 26 Aug. 2021: Correction of bug affecting printing of intermediate frame name in transformation from ITRF2014 to ETRF93. Coordinate and velocity values were not affected. Thanks to Mehdi Daakir for notifying us of this problem.
• 14 Apr. 2021: Correction of bug affecting transformation from ITRF2005 to ETRF2005 causing transformation to ITRF2000 instead of ETRF2005. Thanks to Jeffrey Verbeurgt for notifying us of this problem.
• 16 Mar. 2021: Correction of bug affecting transformation from ITRF2000 to ITRF89 at different epochs (using site velocities). Thanks to Karlheinz Gutjahr for notifying us of this problem.
• 02 Apr. 2020: Correction of bug in transformation from ITRF93 to ETRF2000. Thanks to Lennard Huisman for notifying us of this problem.
• 29 Jul. 2019: Correction of bug in transformation from ITRF92 to ETRF92. Thanks to Dave Mann from Gardline Limited for notifying us of this problem.
• 29 Jul. 2019: Correction of incorrect frame name in intermediate print (not affecting final results).
• 11 Jan. 2019: Correction of bug in transformation from ETRF2005 to all other systems (except to ITRF2005). Thanks to Yurii Lukianchenko from Lviv Polytechnic National university for notifying us of this problem.
• 07 Nov. 2017: Added transformations from and to ETRF2005 and ETRF2014.
• 04 Apr. 2016: Added transformations from and to ITRF2014.
• 13 Apr. 2015: Correction of incorrect frame name in intermediate print (not affecting final results).
• 20 Sep. 2012: Use new subroutine PRINTSTEP to print intermediary results.
• 30 Mar. 2012: Correction of bug in transformation from ETRS89 to ITRS when different in and out epochs.
• 06 Dec. 2010: Added transformation from and to ITRF2008.
• 16 Apr. 2010: Added transformations from and to ETRF89, ETRF90, ETRF91, ETRF92, ETRF93,ITRF88, ITRF89, ITRF90, ITRF91, ITRF92, ITRF93.
• 06 Jan. 2010: V1.Correction of bug in transformation from ETRF2000 to ITRF2000.

References

• EUREF Technical Note 1: Relationship and Transformation between the International and the European Terrestrial Reference Systems http://etrs89.ensg.ign.fr/pub/EUREF-TN-1-Mar-04-2024.pdf
• Transformation parameters from ITRF web site: https://itrf.ign.fr/en/solutions/transformations