Home > Keywords > Articles spéciaux > onglet

onglet

Articles

  • 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 (…)

  • 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, (…)

  • 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 (…)

  • Not available yet
    21 February 2017, by Mikaël Guichard

    Work in progress...

  • Statistics
    27 May 2022, by Médéric Gravelle

    Vertical velocity field Estimated (robust) velocities: 546 CGPS@TG 461 Average of formal errors: 0.38 mm/yr Median of formal errors: 0.28 mm/yr

  • Téléchargements
    3 novembre 2020, par Médéric Gravelle

    Pour affecter des incertitudes plus réalistes aux vitesses GPS, le contenu en bruit dans les séries temporelles de positions a été analysé avec la technique de l’estimateur du maximum de vraisemblance (MLE) en utilisant le logiciel CATS. La tendance a été supprimée des séries temporelles à l’étape CATREF. Les détails sur l’affectation des incertitudes des vitesses GPS sont renseignés dans l’article cité ci-dessous. Table des vitesses verticales
    La table ULR6b_Vertical-Velocities_Table (…)

  • Statistiques
    14 novembre 2022, par Médéric Gravelle

    Champs de vitesse vertical Vitesses (robustes) estimées : 546 CGPS@TG 461 Moyenne des erreurs formelles : 0.38 mm/an Médiane des erreurs formelles : 0.28 mm/an

  • 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 (…)

  • Fournisseurs GNSS
    6 janvier 2017, par Mikaël Guichard
  • 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 (…)