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  • The historical French heritage
    14 December 2010, by Frank

    France is very rich in systematic observations of coastal sea level over long time periods. The oldest (published) series of measurements were performed by the astronomers La Hire and Picard at Brest, France, in 1679, over about ten days. They repeated the experiment in 1692, over several months, again in Brest. Their aim was to study the tides and their results showed the fundamental importance of observation to understand and determine the characteristics of tides in a given place for the (…)

  • Data access
    14 February 2008, by Guy Woppelmann

    The GPS observations are published on the anonymous FTP server of SONEL (ftp.sonel.org). The conditions of access are that the origin of the data is acknowledged in all communications, oral or written. Further details.
    The FileZilla tool is a free client ftp which allows you to access the data.

  • Download
    8 January 2020, by Médéric Gravelle

    – Vertical velocities table
    The NGL14_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties from the 1069 stations fulfilling the criteria of 3 years of minimum length and data gaps not exceeding 30%, estimated by the NGL group using MIDAS (Blewitt et al. 2016). Daily time series
    The NGL14.zip file contains individual station data files of daily position time series in ITRF2014 with respect to the position at the mid time series epoch. These positions are (…)

  • 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, (…)

  • About
    6 February 2014, by eprout01

    This is not really a direct product from SONEL data, but the French tide gauges and their associated data distributed by SONEL helped validating the model, and SONEL supports the distribution of its results.
    Two wave numerical hindcast were realized for the North Atlantic Ocean based on the code WaveWatchIII (hereafter WWIII, Tolman, 2009). The former employs a 1°*1° spatial resolution and is forced by wind fields originating from the 20CR reanalysis (Compo et al., 2011) over the (…)

  • 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 (…)

  • Mesures d’étalonnage
    3 avril 2008, par Guy Woppelmann

    Il s’agit de mesures de hauteur d’eau effectuées en simultanée au marégraphe et à un dispositif considéré comme étalon, souvent une sonde électrique (sonore ou lumineuse). Lorsque ces mesures sont conduites sur un cycle de marée complet (12h25), elles permettent de construire un diagramme de Van de Casteele. La forme de ce diagramme est très instructive ; elle permet d’évaluer les performances du marégraphe et de déceler des défauts de fonctionnement. Ce type de contrôles est recommandé par (…)

  • French contribution
    22 August 2017, by Frank

    Observation stations contributing to GLOSS
    The map on the right shows the French stations contributing to the GLOSS core network of stations, a contribution which was agreed by France when the programme was started at the beginning of the 1980s. Despite its heritage and the wealth of sea level data, the French contribution to the world programme appears relatively modest. There are numerous organisations which use the tide gauges in France as part of their missions. Nevertheless the (…)

  • Download
    4 March 2020, by Médéric Gravelle

    To assign more realistic uncertainties on the GPS velocities, the noise content in the position time series was examined by the maximum likelihood estimation (MLE) technique using CATS software (Williams, 2008). Time series were detrended at the CATREF stage. Details on the GPS velocity uncertainty assessment are given in the reference below. Vertical velocities table
    The ULR6b_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties for the 493 stations fulfilling (…)

  • About
    14 October, by Médéric Gravelle

    The ULR20 GNSS solution is the result of the reanalysis of 26 years of GNSS data from 2000 to 2025 that has been undertaken within the framework of the SPOTGINS collaborative project. Its associated vertical velocity field is expressed in IGS2020 reference frame.
    The daily PPP position time series have been produced using the GINS software (CNES) and precise GPS & Galileo orbit/clock products of the CNES-CLS IGS Analysis Center.
    Position time series expressed in IGS2020 were then (…)