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ITRF2008 is the new realization of the International Terrestrial Reference System. Following the procedure already used for the ITRF2005 formation, the ITRF2008 uses as input data time series of station positions and Earth Orientation Parameters (EOPs) provided by the Technique Centers of the four space geodetic techniques (GPS, VLBI, SLR, DORIS). Based on completely reprocessed solutions of the four techniques, the ITRF2008 is expected to be an improved solution compared to ITF2005.

Input data used for ITRF2008
  • Space geodesy solutions from 4 space geodesy techniques. Description
Computation strategy (description, discontinuities etc...)
Scale and Geocenter time series

 Detrended PlotsPlots with respect to ITRF2008
VLBIPlot Time Series Plot Time Series 
SLRPlot Time SeriesPlot Time Series
DORISPlot Time SeriesPlot Time Series

Station position residuals

Download residuals files. On line residuals plots.

ITRF2008 files

ITRF2008 velocity field
Figure 1: ITRF2008 velocity field


The IERS ITRS Product Center is indebted to the Technique Services (IDS, ILRS, IGS and IVS) and their Analysis and Combination Centers for their contribution by providing reprocessed solutions. The quality of the ITRF2008 is certainly benefiting from these technique improved solutions. Many institutions and individuals have also contributed to the ITRF2008 project. We also acknowledge the contribution of DGFI colleagues to the ITRF2008 analysis.
The IERS ITRS Product Center is particularly grateful to all the institutions who provide the necessary investment for the space geodetic observatories which constitute the main ITRF foundation.

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