Representation of Uncertainty in GPS data product Earth System Data Records

SOPAC and JPL have collaborated through the MEaSUREs SESES program to provide Level 1A ESDR's of automated weekly-updated, long-term (from 1995 to the present) raw geodetic position time series of over 1000 stations in the Western U.S. (including all PBO sites) and global stations. In addition, JPL and SOPAC provide Level 1B ESDR's of automated weekly updates of calibrated, validated, and filtered time series for stations in the Western U.S. based on the combined solutions of independent JPL and SOPAC analyses. We also provide Level 2 ESDR's consisting of velocity field and velocity field histories in various geodetic reference frames. Strain and strain rate fields, Level 3 ESDR's, will also shortly be in production. All products are available to the public through NASA's GPS Explorer gridsphere-based data portal. A new set of geodeticML schemas and a downloadable metadata viewer are being developed which allow the inclusion of processing metadata and versioning information in addition to other data quality information, such as outliers and chi-squared and rms values of the overall combination process. The incremental chi-squared fit of each subnetwork, adjustment value and sigma for each site are calculated and used to tag as anomalous those sites with 3 times the formal uncertainty. Another set of files generated weekly as part of our recursive processing and evaluation of the time series, detects signals such as postseismic decays, outliers and trends still apparent in the adjustment residuals.