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IGS Quality of Service Fact Sheet


The International GNSS Service (IGS) provides the highest quality GNSS data, products, and services in support of the terrestrial reference frame; Earth observations and research; Positioning, Navigation, and Timing (PNT); and other applications that benefit the scientific community and society.

The IGS operates a global network of Global Navigation Satellite System (GNSS) ground stations, data centers, and data analysis centers to provide data and derived data products that are essential for Earth science research; multi-disciplinary positioning, navigation, and timing (PNT) applications; and education.

The foundation of the IGS is a global network of over 400 permanent, continuously operating, geodetic quality stations tracking GPS, GLONASS, Galileo, BeiDou, QZSS, and SBAS. 

Station data is archived at IGS Global Data Centers and four Regional Data Centers. Analysis Centers regularly process the data and contribute products to the Analysis Center coordinator, who produces the official IGS combined products. 

The Central Bureau is responsible for day-to-day management of the IGS, following policies set by the IGS International Governing Board.

The IGS reference frame coordinator determines tracking site coordinates and velocities in the International Terrestrial Reference Frame (ITRF), and organizes the IGS contribution to ITRF.



  • GNSS satellite ephemerides
  • Earth rotation parameters
  • Global tracking station coordinates and velocities
  • Satellite and tracking station clock information
  • Zenith tropospheric path delay estimates 
  • Global ionospheric maps 

These products support Earth science analyses and other efforts, such as: Improving and extending the International Terrestrial Reference Frame (ITRF) maintained by the International Earth Rotation and Reference Systems Service (IERS); monitoring deformation of the Earth; monitoring Earth rotation; monitoring the troposphere and ionosphere; determining orbits of scientific satellites; and other diverse applications.


Organizational Values

  • Advocacy of an open data policy, with data and products readily available,
  • Welcome contributions from and participation with all organizations,
  • Effective reliability through redundancy of IGS components,
  • Technical evolution through “friendly competition”,
  • Dedicated engagement with policy entities to raise mutual awareness of IGS and geodesy in general.