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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 (…)

  • 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. (…)

  • 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.

  • 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
    25 August 2020, by Médéric Gravelle

    The GNSS solution named ’GT2’ is produced by the German Research Centre for Geosciences (GFZ) for the International GNSS Service (IGS) working group TIGA. It contains position time series for 757 permanent GNSS stations expressed in the ITRF2014 reference frame over the period January 1994 to December 2015. This GNSS solution was carried out within the framework of the 2nd IGS reanalysis (reprocessing) campaign (Repro2). Among the 757 stations processed by GFZ, as many as 538 have (…)

  • À-propos
    18 septembre 2014, par Cyril Poitevin

    Le concept de base de la tectonique des plaques est que, en première approximation, la surface de la Terre est divisée en plusieurs plaques rigides qui bougent les unes par rapport aux autres mais ne se déforment pas. Le mouvement de chaque plaque peut être décrit par son pôle Eulérien (coordonnées et vitesse angulaire). Dans le but de mieux visualiser la déformation interne d’une plaque et les mouvements relatifs entre les plaques, nous proposons un outil permettant de sélectionner une (…)

  • Role of SONEL
    27 October 2011, by Guy Woppelmann

    In addition to its national scope with its specific aims associated with a national research observation infrastructure on sea level, SONEL plays the role of GNSS at tide gauge data assembly centre for the GLOSS programme since 2011 (see GLOSS Implementation Plan - 2012, pp. 23). SONEL is also the primary data centre 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.
    Consequently, SONEL (…)

  • Calibration measurements
    10 December 2010, by Frank

    These are measurements of the water level which are carried out simultaneously with a tide gauge and an instrument that is used as a standard, often an electric sound/light sensor. When the measurements are performed over a complete tide cycle (12h25), they can be used to produce a Van de Casteele diagram. The shape of this diagram is highly instructive; it can be used to assess the performances of the tide gauge and to detect any operational defects. This type of test is recommended by (…)

  • DOI ULR-repro3 solution
    27 May 2022, by Médéric Gravelle

    – General information Access the data by clicking on the Download tab
    Title: GPS Solution ULR7a DOI identifier: 10.26166/sonel_ulr7a Publisher: SONEL Data Assembly Centre Publication year: 2022 Version: a Temporal coverage: 2000-01-01 / 2020-12-31 Tile: The ULR-repro3 GPS data reanalysis solution (aka ULR7a) Language: English Authors
    Médéric Gravelle [1], Kevin Gobron [2], Guy Wöppelmann [1] Affiliation: [1]: UMR 7266 LIENSs, CNRS/LRU, La Rochelle, (…)

  • 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 (…)