The University of La Rochelle’s group (ULR) has recently reprocessed data from a global GPS network of 750 globally distributed stations spanning 20 years from 1995 to 2015. This effort was part of the second International GNSS Service reanalysis campaign for the next International Terrestrial Reference Frame. We estimated velocities for 500 stations, 325 of which are located less than 15 km from a tide gauge station.

Here, I present the estimated ULR vertical velocities and show comparisons with different GPS estimates to highlight the progress that has been made in this field. Comparison to modeled GIA land motion is also provided. Particular focus is given to the discussion of limitations that arise when using GPS velocities to correct the vertical land motion from tide gauge observations of sea level.