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  • 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, (…)

  • Statistics
    8 January 2020, by Médéric Gravelle

    Vertical velocity field Estimated (robust) velocities: 1069 CGPS@TG 872 Average of formal errors: 0.83 mm/yr Median of formal errors: 0.67 mm/yr

  • About
    4 March 2020, by Médéric Gravelle

    The ULR6b GPS solution is an updated version of ULR6a. That is, ULR6b is aligned in the ITRF2014 reference frame, instead of ITRF2008 for ULR6a. Both UMR6 solutions result from the reanalysis of 19 years of GPS data from 1995 to 2014, carried out within the framework of the 2nd reanalysis (reprocessing) campaign (repro2) of the International GNSS Service (IGS).
    Double-differenced ionosphere-free GPS carrier phase observations from a global network of 756 stations were reanalyzed using (…)

  • Comment accéder aux observations des marégraphes ?
    20 février 2011, par Mikaël Guichard

    Les fichiers de valeurs moyennes
    Seules les moyennes calculées à partir des données contrôlées sont fournies dans les fichiers de valeurs. Dans les graphiques, en revanche, sont représentées les moyennes calculées à partir des observations contrôlées (en bleu) et non-contrôlées (en rouge). Les moyennes sont calculées à partir du filtre de Demerliac et du filtre de Doodson, avec possibilité de choix pour l’utilisateur. Un exemple est donné dans l’image ci-dessous, prise de la page de la (…)

  • Results of the calibration tests
    10 December 2010, by Frank

    The results of the test measurements ’in situ’ are directly incorporated into the pages corresponding to the tide gauge in question. The test missions are generally the subject of a report in which the results of the use of the calibration measurements (Van de Casteele diagram) are published. Here is an example: test of the tide gauge at Socoa (Saint Jean-de-Luz) in May 2007.