Realization of ITRF2014

The International Terrestrial Reference Frame (ITRF) is the result of an inter-technique combination of all four space geodetic techniques:

• -Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)
• -Global Navigation Satellite Systems (GNSS)
• -Satellite Laser Ranging (SLR)
• -Very Long Baseline Interferometry (VLBI)