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  • 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 (…)

  • About
    16 September 2014, by Médéric Gravelle

    The basic concept of plate tectonics is that, to a first approximation, the Earth surface is divided into several rigid plates that move with respect to one another but do not deform internally. The motion of each plate can be described by its Eulerian pole (coordinates and angular velocity). In order to better visualize the internal deformation of a single plate and to visualize the relative movements between plates, we propose a tool to select a reference plate, whose motion can be (…)

  • About
    13 September 2013, by Mikaël Guichard

    – Relative sea level trends: The relative sea level trends have been estimated by the PSMSL from the RLR tide gauge dataset of annual times series longer than 30 years with more than 70% of valid data. Only results from tide gauges for which a robust GPS velocity is available are displayed. (More about the PSMSL relative sea level trends). Absolute sea level trends: The absolute (geocentric) sea level trends build upon the above-mentioned relative sea level trends by simply adding the (…)

  • Not available yet
    21 February 2017, by Guy Woppelmann

    Work in progress...

  • Download
    27 May 2022, by Médéric Gravelle

    – Vertical velocities table
    The ULR7a_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties for the 546 stations fulfilling the criteria of 3 years of minimum length without discontinuities and with data gaps not exceeding 30%.
    The velocities come from the adjustment of both a functionnal and stochastic model, the latter accounting for a linear combination of white noise and power law process, whose parameters were estimated using the Restricted Maximum (…)

  • 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 (…)

  • Téléchargements
    14 novembre 2022, par Médéric Gravelle

    – Table des vitesses verticales
    La table ULR7a_Vertical-Velocities_Table donne les vitesses verticales GPS et leur incertitude pour les 546 stations satisfaisant les critères de 3 ans minimum de longueur sans discontinuités, avec des "trous" n’excédant pas les 30%.
    Les vitesses viennent de l’ajustement d’un modèle fonctionnel et d’un modèle stochastique, celui-ci prenant en compte une combinaison linéaire de bruit blanc et de processus en loi puissance, dont les paramètres ont été (…)

  • How to access the tide gauge observations
    20 February 2011, by Guy Woppelmann

    The files of average values
    Only the daily, monthly and annual averages calculated from quality controlled (QC’ed) data are provided in the data files. However, the graphs show the averages calculated from QC’ed observations (in blue) and non-QC’ed observations (in red). The averages are calculated from the Demerliac filter and the Doodson filter, with the possibility of a choice for the user. An example is given on the image below, which is taken from the web page of the La Rochelle (…)

  • GNSS Data Providers
    9 January 2017, by eprout01
  • Description des balises DORIS
    3 avril 2008, par Guy Woppelmann

    Le réseau de balises DORIS est déployé et maintenu par l’IGN depuis 1986. Des fiches géodésiques décrivent les stations DORIS de ce réseau. Elles sont disponibles sur le site de l’IDS (International DORIS Service) à travers une page qui propose également une carte dynamique montrant la distribution géographique du réseau (cliquez sur le lien pour y accéder).