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  • Programme GLOSS
    21 août 2017, par Guy Woppelmann

    The Global Sea Level Observing System (GLOSS) was established by the UNESCO Intergovernmental Oceanographic Commission (IOC) in 1985 to establish a well-designed, high-quality in situ sea level observing network to support a broad research and operational user base.
    GLOSS provides oversight and coordination for global and regional sea level networks that supports the oceanographic and climate research communities based on feedback and direction from within these communities. GLOSS remains (…)

  • Which GNSS solutions ?
    10 December 2010, by Frank

    – The processing of GPS observations is particularly complex for the calculation of vertical movements of the land on which the tide gauges are placed (movements of the order of mm/year). The article published in 2007 by the members of the consortium of the ‘ULR’ GPS analysis centre describes the difficulties and the challenges raised by this issue. The figure opposite illustrates the challenges : shown on the left is a series of average sea levels measured with tide gauges ; in the middle (…)

  • Description of the DORIS tracking beacons
    10 December 2010, by Frank

    The DORIS network of tracking beacons was established by IGN in 1986 and has been run and maintained by them since then. Geodetic files describe the stations of the DORIS network. They are avilable on the web site of IDS (International DORIS Service) on a page that also has a dynamic map showing the geographical distribution of the network (click on the link).

  • DOI ULR6a solution
    16 May 2024, by eprout01

    – General information Access the data by clicking on the Download tab
    Title: GPS Solution ULR6a DOI identifier: 10.26166/sonel_ulr6a Publisher: SONEL Data Center Publication year: 2016 Version: a Temporal coverage: 1995-01-01 / 2014-12-31 Language: English Creators
    Alvaro Santamaria-Gomez [1], Médéric Gravelle [2], Guy Wöppelmann [2] Affiliation: [1] GET, Observatoire Midi-Pyrénées/CNRS/IRD/UPS, Toulouse, France. [2] LIENSs, CNRS/ULR, La Rochelle, (…)

  • Statistics
    4 March 2020, by Médéric Gravelle

    General Analysis center: ULR Number of stations: 674 Solution: ULR6B CGPS@TG 482 Date of publication: 2020 Reference Frame 194 Time span: 1995.0 - 2013.9 Others 77 Reference Frame: ITRF 2014
    Vertical velocity field Estimated (robust) velocities: 493 CGPS@TG 349 Average of formal errors: 0.54 mm/yr Median of formal errors: 0.36 mm/yr

  • Le patrimoine historique
    28 mars 2008, par Guy Woppelmann

    La France est très riche en observations systématiques de hauteur d’eau le long des côtes sur de longues périodes de temps. Les plus anciennes séries de mesures (publiées) furent réalisées par les astronomes La Hire et Picard à Brest, en France, en 1679 pendant une dizaine de jours. Ils renouvelleront leur expérience en 1692, pendant plusieurs mois, toujours à Brest. Leur objectif : l’étude de la marée. Leurs résultats montreront l’intérêt fondamental de l’observation pour connaître et (…)

  • About
    27 May 2022, by Médéric Gravelle

    The ULR7a GPS solution is a preliminary version of the reanalysis of 21 years of GPS data from 2000 to 2020 that has been undertaken within the framework of the 3rd data reprocessing campaign of the International GNSS Service (IGS). Its associated vertical velocity field is expressed in ITRF2014.
    Double-differenced ionosphere-free GPS carrier phase observations from daily regional (plus one global) networks of 546 stations were reanalyzed using a free-network strategy (station positions, (…)

  • Téléchargements
    27 janvier 2020, par Médéric Gravelle

    – Table des vitesses verticales
    La table JPL14_Vertical-Velocities_Table contient les vitesses verticales GPS estimées par le groupe JPL pour les 436 stations satisfaisant les critères de 3 ans minimum de longueur avec des "trous" n’excédant pas les 30%.
    – Séries temporelles journalières
    Le fichier JPL14.zip contient les séries temporelles individuelles de positions des stations exprimées dans l’ITRF2014, calculées par le groupe JPL, par rapport à la position à l’époque de référence (…)

  • Which observations ?
    16 February 2011, by Frank

    The tide gauge observations are heights of sea level expressed with respect to an arbitrary (conventional) and local datum. Hence, the term relative sea level is often used (relative to the land upon which the tide gauge is grounded).
    The sea level data available on SONEL are: daily mean sea levels obtained from different tidal filters (e.g., Doodson, Demerliac); monthly and annual mean sea levels, which contribute to the world data bank of the PSMSL.
    Other kinds of water levels are (…)

  • Download
    20 February 2017, by Mikaël Guichard

    The web map enables the users to navigate from one site (station) to another, and click on a specific site in the map to see its attributes. By clicking further, an individual web page for the site can be accessed, where details on the data and meta-data are displayed for that site. The user can then get some additional statistics and download files with the associated time series (sea level differences...). Here, we provide a more comprehensive means to download the data from all the sites. (…)