Home > Keywords > Articles spéciaux > onglet

onglet

Articles

  • 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 (…)

  • 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
    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 (…)

  • About
    17 January 2020, by Médéric Gravelle

    The GNSS solution named ’JPL14’ is produced by the Jet Propulsion Laboratory (JPL) group using a Precise Point Positioning (PPP) data analysis strategy. JPL’s GipsyX software is employed to produce daily position time series for over 2,000 globally distributed stations using JPL satellite orbits and clock products expressed in the IGS14 reference frame. The data set covers the period January 1994 to April 2022. This GNSS data analysis strategy complies with the standards (models, (…)

  • Accès aux données
    11 décembre 2010, par Mikaël Guichard

    Les observations GPS sont accessibles sur le serveur FTP de SONEL (ftp.sonel.org) de manière anonyme. Les conditions d’accès sont de citer la source des données dans toute communication, orale ou écrite. Plus de détails.
    L’outil FileZilla est un client FTP gratuit qui permet d’accéder facilement aux données.

  • DOI ULR6a solution
    16 mai 2024, par eprout01
  • Statistics
    17 January 2020, by Médéric Gravelle

    Vertical velocity field Estimated (robust) velocities: 436 CGPS@TG 281 Average of formal errors: 0.42 mm/yr Median of formal errors: 0.32 mm/yr

  • Last data events
    28 February 2020, by eprout01

    table td, table th border: 1px solid #B47529; padding: 3px; table tbody tr td + td+td+td,table tbody tr td+td+td+td+td+td+td+td white-space: nowrap;
    This page enumerates the last events that occured concerning the data recovering in SONEL. Here are the significations of the different event types:
    New sitelog: a new site log has been recovered within the last 4 weeks. New GNSS: a new GNSS station has been included in SONEL within the last 2 months. New (…)

  • 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 (…)

  • 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 (…)