Data Access

Background, Definitions and Responsibilities

IGS Data Centers fall into three categories: Operational, Regional, and Global Data Centers.

 

Operational Centers

Operational Centers are in direct contact with tracking sites. Their tasks include station monitoring, data validation, suitable data reformatting into an exchange format (RINEX), compression of data files, maintenance of a local archive of the tracking data in its original receiver format and the exchange format, as well as the electronic transmission of data in exchange format to a Regional or Global Data Center. The Operational Center must download data from the receivers located at IGS stations on a timely basis without interruption, or as specified to meet the requirements of at least one type of IGS product. Details are available in the “IGS Site Guidelines” document. Operational Centers may or may not allow users direct access to their data holdings.

 

Regional Data Centers

Regional Data Centers collect tracking data in exchange format from several Operational Centers and/or stations, maintain a local archive of the data received, provide on-line access to these data to the user community of the region, and transmit data from a subset of their sites (minimally, IGS reference frame stations) to the Global Data Centers. The set of stations archived may be either a limited geographic region (e.g., Europe, Australia, etc), or those stations managed by the archiving agency.

 

Global Data Centers

Global Data Centers are the main interfaces to the Analysis Centers and the user community in general.  They receive/retrieve, archive, and provide online access to tracking data provided by the Operational/Regional Data Centers.  At a minimum, Global Data  Centers  archive 30-second  sampling  interval data  from  IGS sites identified as reference frame stations. The Global Data Centers also archive and provide online access to IGS products. Finally, the IGS Global Data Centers backup and secure their holdings of IGS data and products, exchanging data between other data centers in order to ensure equalization of data holdings.

Although station operators are required to validate data prior to transmission, data centers at all levels should also perform routine quality control on incoming data as additional prevention of providing bad or corrupt data.

 

Data Center Contents

All DCs should retain logs of IGS data and product file retrievals for at least one year, but preferably indefinitely. The CB may request such information from time to time, for the purpose of collecting statistics on the usage of IGS data and products.

The online archive of GNSS data available through the IGS Global Data Centers should include:

  • Daily files of GNSS data (minimum all IGS reference frame stations) at a 30- second sampling rate (minimum of one year online; older data may be near-line).
  • Hourly files of GNSS data at a 30-second sampling rate (minimum of three days online; older data may be purged)
  • High-rate, low-latency GNSS data.

All data should be available in RINEX format, both Hatanka-compacted and Unix (.Z)-compressed. The data archive should also include broadcast ephemeris, and meteorological RINEX files.

The online archive of IGS products available through the IGS Global Data Centers should include:

  • Weekly solutions of classic IGS Final products from the IGS Analysis Centers
  • Combined weekly solution from the IGS Analysis Center Coordinator
  • Daily rapid and sub-daily ultra-rapid solutions from the IGS Analysis Center Coordinator
  • Weekly and cumulative combined station coordinates and velocities from IGS Reference Frame Coordinator
  • Associate  Analysis  Center products  as  they are  approved  by the  IGS Governing Board as Pilot Projects or Working Groups, including: GLONASS orbits, Regional  and  Global Network  Analysis  Center solutions  in  SINEX format, Zenith path delay files from the Troposphere Working Group, and Ionosphere parameters from the Ionosphere Working Group

 

New Data Centers

Proposals for a new Data Center should begin with a conversation with the Data Center Working Group (DCWG). The DCWG and Central Bureau can assist in bringing a letter stating the agency’s qualifications, commitment, and plans to the GB. Based on recommendations of the DCWG, and demonstrated commitment of the host organization, the proposed DC will be evaluated and considered for approval by the GB.

The IGS maintains a number of FTP sites where the IGS products and related information can be accessed by users.

The principal FTP sites include:

  • Central Bureau, Jet Propulsion Laboratory, USA IGS CB
  • CDDIS Global Data Center, Godard Space Flight Center, USA CDDIS
  • SOPAC Global Data Center, Scripps Institute of Oceanography, USA SOPAC
  • IGN Global Data Center, Institut Geographique National, France IGN
  • KASI Global Data Center, Korean Astronomy and Space Center, South Korea KASI
  • Wuhan University, WHU
  • European Space Agency / ESAC, ESA / ESAC

 

The roles of the different IGS Data Centers are described within the Charter for IGS Data Centers. For data access please visit the centers.

Global Data Center

 

Regional Data Center

Institution Abbreviation Country
Geoscience Australia (formerly AUSLIG) GA Australia
Wuhan University WHU China
Bundesamt für Kartographie und Geodäsie BKG (IfAG) Germany
RDAAC-IRIS RDAAC-IRIS Russia
Hartebeesthoek Radio Astronomy Observatory HRAO South Africia
NGS/NOAA Operational Data Center NGS/NOAA United States
Jet Propulsion Laboratory JPL United States

 

Operational Data Center

Institution Abbreviation Country
Geoscience Australia (formerly AUSLIG) GA Australia
Geological Survey of Canada PGC Canada
Geodetic Survey of Canada NRCAN Canada
Kort & Matrikelstyrelsen/National Survey & Cadastre KMS Denmark
Centre National d’Etudes Spatiales CNES France
European Space Agency/ESOC ESA/ESOC Germany
GeoForschungsZentrum GFZ Germany
Hartebeesthoek Radio Astronomy Observatory HRAO Italy
Italian Space Agency ASI Italy
Geographical Survey Institute GSI Japan
Delft University of Technology DUT Netherlands
Norwegian Mapping Authority SK Norway
RDAAC-IRIS RDAAC-IRIS Russia
Jet Propulsion Laboratory JPL United States
NGS/NOAA Operational Data Center NGS/NOAA United States
Scripps Orbit and Permanent Array Center SOPAC United States

 

Project Data Center

Institution Abbreviation Country
Universite de La Rochelle > Tide Gauges & GPS TIGA France