Transversal Information System Action

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’ is in charge of their archiving and distribution, including at the European level via the Epos infrastructure. The Résif data services are developed, distributed and maintained by ISTerre’s (Osug).

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.

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

A few figures
In 2021, the Seismological Data Center hosted 7 TB of data from 3894 measurement points of the RLBP, RAP, and Seismob networks, and distributed 85.5 Terabytes of data.

GNSS

A few figures

623 stations permanentes et 50 stations mobiles collectent des données dans le cadre des actions spécifiques Résif-GNSS et Résif-GPSmob. Les centres de données GNSS Résif ont distribué plus de 9 Téraoctets de données en 2021.

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 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. The Glass webservices have been operational since 2021 (https://gnssdata-epos.oca.eu/#/site).

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.

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

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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• TD data
• TR data

Gravimetry

The gravimetric park of Résif PGrav is composed of absolute and relative gravimeters of different classes and different technologies allowing to cover a wide field of applications. The School and Observatory of Earth Sciences (Eost) ensures the collection of raw data (level 1) from these instruments and their deposit on :

the portal of 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 of inclinometers, extensometers, etc.
The IGETS data center, hosted by the GFZ in Potsdam, Germany.

In addition, Eost is responsible for the elaboration of Level 2 data (data pre-processed for tidal analysis) and Level 3 data (residuals after geophysical corrections) from the raw data. These level 2 and 3 data are also distributed by the Igets.

The data collected by the mobile instruments are transmitted to the Bureau Gravimétrique International (BGI), a scientific service 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 organizations, also contribute to the acquisition of gravimetric data on the national territory or in other regions of the world.