Transversal Information System Action

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The Résif information system is one of Résif’s three transversal actions. It involves the collection, archiving and distribution of seismological, GNSS and gravimetric data and the coordination thereof.

 

Seismology

Résif seismological data are collected and validated by six centres run by Résif partners which are called “A Nodes”. These centres also produce the metadata required for the ongoing use of seismological signals. The data and metadata are then transmitted to the Résif seismological data centre, ‘B Node’ hosted by the University of Grenoble Alpes for archiving and distribution. The Résif data services are developed, distributed and maintained by ISTerre’s (Osug) Résif team.

The Résif Seismological Data Centre is one of 19 global centres distributing data and metadata in formats and using protocols which comply with International Federation of Digital Seismograph Networks (FDSN) standards. It is also one of the eleven nodes which make up Eida, the European virtual data centre.

A few figures: the data centre provides access to the waveforms of 499 permanent stations (286 of which are specific to the Résif instrumental network) and 2503 temporary stations (220 of which are part of Résif). It collects 8.8 Teraoctets of data each year and disseminates 100 Teraoctets (figures from August 2019).

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http://seismology.resif.fr/resif-information-system/

A few figures
The data centre provides access to the waveforms of 499 permanent stations (286 of which are specific to the Résif instrumental network) and 2503 temporary stations (220 of which are Resif). It collects 8.8 Teraoctets of data each year and distributes 100 Teraoctets of data in response to more than 30 million queries from 2000 unique IP addresses (August 2019 figures).

Résif-SI architecture: Résif information system in seismology.

GNSS

A few figures (March 2020): in total, nearly 5 Teraoctets of data are collected each year via approximately 550 permanent stations and 50 mobile stations as part of the Résif-GNSS and Résif-GPSmob specific action projects.

The Rénag Geodetic Data Centre

This centre is managed and maintained by the Geoazur laboratory within the Observatoire de la Côte d’Azur. The data centre collects, disseminates and archives data from around 75 (in 2020) active stations in the permanent network  which are run by 13 research groups. These operational centres send the raw data recorded on an ftp server to the data centre. For the majority of stations, this is carried out on a daily basis. The raw data are automatically converted into a single standard format and undergo quality control. They are immediately archived and disseminated on a public ftp directory.

In recent years, the information system has evolved. The database architecture has been modernized. Today, scientific users have a web portal allowing them to explore a wide variety of information associated with the stations and observation data files. As part of the construction of the Epos infrastructure, the system has been redesigned and expanded. It is currently being rolled out to become operational in 2020.

Since 2011, the permanent National GNSS Network Rénag also archives and distributes with restricted access the data of the Orpheon network of the private partner Geodata Diffusion. Data from the Geodata/Orpheon network are conditionally accessible for scientific applications.

Some figures: The oldest station in the permanent Rénag network was installed in 1997. Since 2017, a majority of stations (85%) ensure a data availability of more than 90%. In 2020, more than half of the Rénag stations receive signals from the European Galileo system and the majority of stations (about 70%) acquire data with an interval of 1s. The annual volume of observation data is thus growing a great deal due to the modernisation of the network, high-frequency acquisition and the arrival of new GNSS observables. The first Rénag data was acquired in 1997 and the integration of data from the Géodata/Orpheon network since 2007 means that the Rénag data centre now manages 13 TB of data. Since 2013, this figure has increased to more than 1TB/year (up to 2TB in 2016 and 2017). The outgoing data flow corresponds to approximately 650Go/year.

The RGP Geodetic Data Centre

It is managed by the Institut National de l’Information Géographique et Forestière (IGN). The IGN installs its own GNSS stations but also signs agreements with all interested partners to integrate the RGP.

Data from the RGP GNSS stations arrive every hour on the IGN servers, where they are checked, formatted and made available to users under an Open License. On a regular basis, GNSS calculations are performed on all stations, at an hourly rate over the last 6 hours of observation on a daily and weekly basis. The results of these calculations allow in particular the monitoring of the geometric stability of the stations and are also available on the dissemination server.

The main RGP data center hosted by the IGN is relayed by a mirror data center located at the ENSG.

Some figures:

  • 545 stations (as of 5 March 2020), including 503 in mainland France
  • 8 departments or overseas collectivities covered (Guadeloupe, French Guiana, Martinique, Reunion, Mayotte, Saint-Pierre and Miquelon, Saint-Martin, Saint-Barthélémy)
  • Around fifty partners
  • On average 2,4 new stations every month since 2012
  • More than 12,000 new files made available every day, i.e. approximately 9 GB
  • In total, 23 TB of data accessible since 1997, and 3.3 TB for the year 2019 alone
  • On average, 1600 monthly data download requests via the website and as many direct connections to the FTP server.

Regina Data Centre

Regina provides real-time (TR) and delayed-time (TD) data streams.

For TD data, the mission center interfaces with GNSS stations by retrieving raw files (typically every 15 minutes, every hour or once a day) and transforming them into RINEX consumable files. It makes the consumable data available according to validation criteria derived from quality files. More details are available on the Regina project website.

TR data are processed by the Casters. This equipment is used to receive TR data from REGINA GNSS stations and from different entities for redissemination to customers. The Caster uses the NTRIP protocol (Networked Transport of RTCM via Internet Protocol) based on the http protocol for the provision of GNSS data via the Internet. Details on Regina project website.

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Gravimetry

Résif’s permanent gravimetric network consists of superconducting gravimeters (also called cryogenic gravimeters). The Ecole et observatoire des sciences de la Terre (Eost) collects the raw data (level 1) from these instruments and deposits them on :

  • the portal of the International Geodynamics and Earth Tide Service (Igets), a member of the International Association of Geodesy (IAG), whose central office is hosted by Eost, and whose objective is the measurement, archiving and distribution of long time series of superconducting gravimeters, but also inclinometers, extensometers, etc.
  • the IGETS data centre, hosted by the GFZ in Potsdam, Germany.

In addition, Eost is also responsible for the elaboration of level 2 data (pre-processed data to allow tidal analyses) and level 3 data (residues after geophysical corrections). These level 2 and level 3 data are also distributed by Igets.

Resif’s Mobile Gravity Network (GMob) consists of relative field gravimeters and absolute gravimeters. These instruments collect point gravimetric data during research missions conducted in France and abroad by French teams.
The data collected are transmitted to the Bureau Gravimétrique International (BGI), a scientific department of the IAG which ensures the compilation, validation, archiving and availability to the scientific community of all relative or absolute measurements of the Earth’s gravity field (terrestrial, marine, airborne measurements).

Other instruments (relative field gravimeters, superconducting gravimeters or absolute gravimeters), operated by different national agencies, also contribute to the acquisition of gravimetric data on the national territory or in other regions of the world (figures from August 2019).

 

Some figures (August 2019)

Four superconducting gravimeters are the permanent equipment of the Résif Gravity Network. There are six relative field gravimeters and four absolute gravimeters in the mobile park.

Data circuit of the Résif permanent gravimeters © Véronique Bertrand and Jean-Paul Boy, Eost