Realization of ITRF2020

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)