The GNSS solution named ’JPL14’ is produced by the Jet Propulsion Laboratory (JPL) group using a Precise Point Positioning (PPP) data analysis strategy. JPL’s GipsyX software is employed to produce daily position time series for over 2,000 globally distributed stations using JPL satellite orbits and clock products expressed in the IGS14 reference frame. The data set covers the period January 1994 to December 2019.
This GNSS data analysis strategy complies with the standards (models, corrections,...) of the International GNSS Service (IGS) reanalysis (reprocessing) campaigns ; hence the Sixteenth session of the Group of Experts for the Global Sea Level Observing System (GLOSS), held in Busan (Republic of Korea), 11-13 April 2019, tasked the SONEL data assembly centre to consider including the JPL solution (position time series and velocities) for the subset of GNSS stations nearby tide gauges. Among the more than 2,000 stations processed by JPL, as many as 328 have actually been identified as co-located, or nearby, tide gauges.
The GNSS velocities, provided here for 366 stations (nearby tide gauges and reference frame stations included) with a minimum record length of 3 years and data gaps not exceeding 30%, are also produced by JPL.
More details about the GNSS data analysis strategy can be found here.
Vertical velocities table
The JPL14_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties from the 366 stations fulfilling the criteria of 3 years of minimum length and data gaps not exceeding 30%, estimated by the JPL group.
Daily time series
The JPL14.zip file contains individual station data files of daily position time series in ITRF2014 with respect to the position at the epoch 2020-01-01. These positions are expressed in meters in the local frame (North, East, and Up). The reference position and the 3D velocity in the local coordinate system (East, North, Up) are provided in the header of each file.
The JPL14_discontinuities_Table.txt file provides the position offsets that have been estimated by the JPL group.
More information and data sets useful for other applications can be found at the JPL website.
|Estimated (robust) velocities:||366|
|Average of formal errors:||0.62 mm/yr|
|Median of formal errors:||0.47 mm/yr|
Heflin, M., Moore, A., Murphy, D., Desai, S., Bertiger, W., Haines, B., Kuang, D., Sibthorpe, A., Sibois, A., Ries, P., Hemberger, D., Dietrich, A. (2019), Introduction to JPL’s GNSS Time Series.