onglet

Articles

• 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 (…)

• The historical French heritage
  14 December 2010, by Frank

  France is very rich in systematic observations of coastal sea level over long time periods. The oldest (published) series of measurements were performed by the astronomers La Hire and Picard at Brest, France, in 1679, over about ten days. They repeated the experiment in 1692, over several months, again in Brest. Their aim was to study the tides and their results showed the fundamental importance of observation to understand and determine the characteristics of tides in a given place for the (…)

• What GNSS data?
  10 December 2010, by Guy Woppelmann

  The GNSS observations that we provide are in the form of daily 30s files (24h of observations at 30s intervals) in the standard international RINEX format. Further information on the RINEX files.
  Apart from the RINEX observation files of the GNSS stations, SONEL provides ancillary information which enables a precise analysis of the GNSS measurements, in particular :
  – the precise orbits of IGS,
  – the Earth orientation parameters of IGS. Evolution of the number of Rinex files (…)

• Last data events
  28 February 2020, by eprout01

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  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 (…)

• Statistiques
  27 janvier 2020, par Médéric Gravelle

  Champs de vitesse vertical Vitesses (robustes) estimées : 1069 CGPS@TG 872 Moyenne des erreurs formelles : 0.83 mm/an Médiane des erreurs formelles : 0.67 mm/an

• 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

• Download
  14 October 2025, by Médéric Gravelle

  – Vertical velocities table
  The ULR20_Vertical-Velocities_Table provides the vertical GNSS velocities and uncertainties for the 1011 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 PyTRF python library (P. (…)

• Le patrimoine historique
  28 mars 2008, par Guy Woppelmann

  La France est très riche en observations systématiques de hauteur d’eau le long des côtes sur de longues périodes de temps. Les plus anciennes séries de mesures (publiées) furent réalisées par les astronomes La Hire et Picard à Brest, en France, en 1679 pendant une dizaine de jours. Ils renouvelleront leur expérience en 1692, pendant plusieurs mois, toujours à Brest. Leur objectif : l’étude de la marée. Leurs résultats montreront l’intérêt fondamental de l’observation pour connaître et (…)

• 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 (…)

• 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 (…)