onglet

Articles

• 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 (…)

• Data access
  14 February 2008, by Guy Woppelmann

  The GPS observations are published on the anonymous FTP server of SONEL (ftp.sonel.org). The conditions of access are that the origin of the data is acknowledged in all communications, oral or written. Further details.
  The FileZilla tool is a free client ftp which allows you to access the data.

• Téléchargements
  27 janvier 2020, par Médéric Gravelle

  – Table des vitesses verticales
  La table NGL14_Vertical-Velocities_Table contient les vitesses verticales GPS estimées par le groupe NGL en utilisant MIDAS, pour les 1069 stations satisfaisant les critères de 3 ans minimum de longueur avec des "trous" n’excédant pas les 30%.
  – Séries temporelles journalières
  Le fichier NGL14.zip contient les séries temporelles individuelles de positions des stations exprimées dans l’ITRF2014, calculées par le groupe NGL, par rapport à la position à (…)

• About
  22 February 2017, by Mikaël Guichard

  In briefest terms, the approach consists in differencing the sea level time series from a tide gauge with an equivalent time series from satellite altimetry. To the extent that both instruments measure identical ocean signals, their difference is a proxy for the vertical position of the tide gauge. Assuming that the instrumental drifts are negligible, the time series of the sea level differences will then be dominated by vertical land motion at the tide gauge. This is illustrated in the (…)

• French contribution
  22 August 2017, by Frank

  Observation stations contributing to GLOSS
  The map on the right shows the French stations contributing to the GLOSS core network of stations, a contribution which was agreed by France when the programme was started at the beginning of the 1980s. Despite its heritage and the wealth of sea level data, the French contribution to the world programme appears relatively modest. There are numerous organisations which use the tide gauges in France as part of their missions. Nevertheless the (…)

• Download
  20 February 2017, by Mikaël Guichard

  The web map enables the users to navigate from one site (station) to another, and click on a specific site in the map to see its attributes. By clicking further, an individual web page for the site can be accessed, where details on the data and meta-data are displayed for that site. The user can then get some additional statistics and download files with the associated time series (sea level differences...). Here, we provide a more comprehensive means to download the data from all the sites. (…)

• 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

• DOI ULR6a solution
  16 mai 2024, par eprout01
• DOI ULR6a solution
  16 May 2024, by eprout01

  – General information Access the data by clicking on the Download tab
  Title: GPS Solution ULR6a DOI identifier: 10.26166/sonel_ulr6a Publisher: SONEL Data Center Publication year: 2016 Version: a Temporal coverage: 1995-01-01 / 2014-12-31 Language: English Creators
  Alvaro Santamaria-Gomez [1], Médéric Gravelle [2], Guy Wöppelmann [2] Affiliation: [1] GET, Observatoire Midi-Pyrénées/CNRS/IRD/UPS, Toulouse, France. [2] LIENSs, CNRS/ULR, La Rochelle, (…)

• Calibration measurements
  10 December 2010, by Frank

  These are measurements of the water level which are carried out simultaneously with a tide gauge and an instrument that is used as a standard, often an electric sound/light sensor. When the measurements are performed over a complete tide cycle (12h25), they can be used to produce a Van de Casteele diagram. The shape of this diagram is highly instructive; it can be used to assess the performances of the tide gauge and to detect any operational defects. This type of test is recommended by (…)