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Articles

  • About
    8 January 2020, by Médéric Gravelle

    The GNSS solution named ’NGL14’ is produced by the Nevada Geodetic Laboratory (NGL) using a Precise Point Positioning (PPP) data analysis strategy. The GipsyX software (version 1.0) from the Jet Propulsion Laboratory (JPL) is employed to produce daily position time series for over 17,000 globally distributed stations using JPL satellite orbits and clock products expressed in the IGS14 reference frame (Blewitt et al. 2018). The data set covers the period January 1996 to March 2022.
    This (…)

  • Fournisseurs GNSS
    6 janvier 2017, par Mikaël Guichard
  • GNSS Data Providers
    6 January 2017, by Mikaël Guichard
  • Fournisseurs GNSS
    9 janvier 2017, par eprout01
  • Not available yet
    21 February 2017, by Mikaël Guichard

    Work in progress...

  • Statistiques
    3 novembre 2020, par Médéric Gravelle

    Général Centre d’analyse : ULR Nombre de stations : 674 Solution : ULR6B CGPS@TG 482 Date de publication : 2020 Stations de référence 194 Etendue temporelle : 1995.0 - 2013.9 Autres 77 Repère de référence : ITRF 2014
    Champs de vitesse vertical Vitesses (robustes) estimées : 493 CGPS@TG 349 Moyenne des erreurs formelles : 0.54 mm/an Médiane des erreurs formelles : 0.36 mm/an

  • Download
    21 October 2022, by Médéric Gravelle

    – Vertical velocities table
    The GT3_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties from the 296 stations fulfilling the criteria of 3 years of minimum length and data gaps not exceeding 30%, estimated by the GFZ group.
    – Daily time series
    The GT3_neu.zip file contains individual station data files of daily position time series in ITRF2014 with respect to the position at the reference epoch. These positions are expressed in meters in the local frame (…)

  • 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).

  • 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 (…)

  • 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 (…)