Role of SONEL

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Tide gauge at Saint Jean-de-Luz

Since November 2011, the role of GLOSS data assembly center for GNSS (GPS) stations at or nearby tide gauges is played by SONEL. SONEL is supported by the University of La Rochelle and the French INSU/CNRS institute (the founding members are SHOM, IGN, LIENSs and LEGOS). It is the primary data center for the GPS Tide Gauge Benchmark Monitoring (TIGA) pilot project, which has turned into a working group of the International GNSS Service (IGS) in 2010.

SONEL provides information about the status of GNSS stations at or nearby tide gauges through a web-based monitoring facility (e.g., the above tab dynamic map). It assembles, archives, and distributes GNSS observation and metadata. In the latest implementation plan (GIP 2012), GLOSS relies on TIGA (IGS) and SONEL for the assembling, processing and distribution of GNSS data at tide gauges. GLOSS will work with TIGA (IGS) to define the useful sea-level oriented products of GNSS analyses and its most appropriate standards and formats for distribution to the sea-level community, concise while informative and complete.

Key to this endeavor will be the maintenance of survey records linking the GNSS antenna to the tide gauge benchmark. Towards this aim, SONEL has started coordinating with the PSMSL to make this important metadata available for all GLOSS stations (Click on the image for further information).

All tide gauge operators, whether associated with GLOSS or not, are welcome to have their GNSS (GPS) data and metadata included in the SONEL data center facility for ensuring state-of-the-art processing (e.g., by the TIGA data analysis centres). GLOSS national contacts have the responsibility to ensure that the GLOSS requirements are fulfilled at the stations for which the country has committed. The requirements include a GNSS antenna located as close to the gauge as possible (IOC Manuals & Guides, No. 14 (IV), pp. 52).

- First Progress Report on the GNSS at Tide Gauge Activities: SONEL Data Holdings & Tools to access the data, presented at the XIIIth GLOSS group of experts meeting, hosted by the PSMSL, Liverpool (United Kingdom), 30 October to 1st November 2013.

- Second Progress Report on the GNSS at Tide Gauge Activities: SONEL Data Holdings & Tools to access the data, presented at the XIVth GLOSS group of experts meeting, hosted by the National Institute of Oceanography, Goa (India), 21-23 October 2015.