Stations d’observation du réseau GLOSS
La carte ci-jointe souligne dans le réseau de marégraphes GLOSS la contribution à laquelle la France s’est engagée au moment de l’élaboration du programme au début des années 1980. La contribution française au dispositif mondial peut paraître modeste au regard de son héritage et la richesse en observations du niveau de la mer. Nombreux sont en effet les organismes qui, dans le cadre de leurs missions, exploitent des marégraphes en France. Mais elle (...)
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Contribution française
28 mars 2008, par Guy Woppelmann -
Not available yet
21 February 2017, by Guy WoppelmannWork in progress...
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Calibration measurements
10 December 2010, by FrankThese 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 (...)
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Statistics
17 October 2013, by eprout01This graph shows the evolution of the number of Rinex files available on SONEL (per DOY) since 1990-079.
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Le patrimoine historique
28 mars 2008, par Guy WoppelmannLa 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 (...)
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What is GLOSS?
7 February 2017, by Guy WoppelmannThe Global Sea Level Observing System (GLOSS) was established by the UNESCO Intergovernmental Oceanographic Commission (IOC) in 1985 to establish a well-designed, high-quality in situ sea level observing network to support a broad research and operational user base.
GLOSS provides oversight and coordination for global and regional sea level networks that supports the oceanographic and climate research communities based on feedback and direction from within these communities. GLOSS (...) -
Download
25 August 2020, by Médéric Gravelle– Vertical velocities table
The GT2_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties from the 593 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 GT2_neu.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 expressed in meters in the local (...) -
Download
4 March 2020, by Médéric GravelleTo assign more realistic uncertainties on the GPS velocities, the noise content in the position time series was examined by the maximum likelihood estimation (MLE) technique using CATS software (Williams, 2008). Time series were detrended at the CATREF stage. Details on the GPS velocity uncertainty assessment are given in the reference below. Vertical velocities table
The ULR6b_Vertical-Velocities_Table provides the vertical GPS velocities and uncertainties for the 493 stations (...) -
About
4 March 2020, by Médéric GravelleThe ULR6b GPS solution is an updated version of ULR6a. That is, ULR6b is aligned in the ITRF2014 reference frame, instead of ITRF2008 for ULR6a. Both UMR6 solutions result from the reanalysis of 19 years of GPS data from 1995 to 2014, carried out within the framework of the 2nd reanalysis (reprocessing) campaign (repro2) of the International GNSS Service (IGS).
Double-differenced ionosphere-free GPS carrier phase observations from a global network of 756 stations were reanalyzed using (...) -
Accès aux données
11 décembre 2010, par Mikaël GuichardLes 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.