OCCAM VLBI Processing Software FTP site
Geodetic Very Long Baseline Interferometry (VLBI) observations provided the first direct confirmation of tectonic plate motion
at the end of the 1980s. Now VLBI observations measure the motions of stations with accuracy better than 1mm/year together
with other space geodetic techniques such as Global Positioning System (GPS) and Satellite Laser Ranging (SLR) Analysis.