Bamahry, Fikri ; Legrand, Juliette ; Bruyninx, Carine

Poster presented at EUREF Symposium 2024, Barcelona, Spain on 2024-06-07

Abstract: The European Plate Observing System (EPOS) is a European research e-infrastructure that aims to enhance the integration, accessibility, and utilization of multi-disciplinary datasets and services for Solid Earth research. EPOS’ GNSS (Global Navigation Satellite Systems) component, through the EPOSGNSS Data Gateway, provides access to GNSS RINEX data from a distributed infrastructure of twelve data nodes. In this poster, we introduce the new EPOS community web portal (https://gnssqualityepos.oma.be) developed by the Royal Observatory of Belgium as the frontend of the EPOS-GNSS Data Quality Monitoring Service (DQMS). This web portal provides the necessary information for monitoring the availability and quality of daily GNSS data that are discoverable through EPOS. Currently, the web portal includes tracking performances of more than 1700 GNSS stations. Several GNSS data quality indicators (DQIs), such as the number of observed versus expected observations, the number of missing epochs, the number of observed satellites, the maximum number of observations, the number of cycle slips, the Standard Point Positioning (SPP) results, and the multipath values on code observations are monitored, and their plots are available online. This unique set of DQIs is provided in the web portal to give helpful information that can be used to detect a potential degradation of the quality of the GNSS observations. Additionally, alarms have been developed to warn data nodes or station managers when expected GNSS data are not available or when there is a degradation in the quality of GNSS data. Here we will present the web portal, the considered data quality indicators, and an example of its usage for detecting GNSS elevation cut-off changes that were not reported in station site logs.

Keyword(s): EPOS GNSS data quality
Funding: ESFRIFED/ EF/211/SERVE / SERVE