Abstract
International Association of Geodesy (IAG) launched the International GPS Service for Geodynamics (IGS), a service to support the use of data from the Global Positioning System (GPS) at the beginning of 1994. IGS data is obtained from approximately 40 globally distributed GPS tracking sites, three global data centers, five operation or regional data centers, seven analysis centers, and a central bureau. IGS provides high‐quality orbits for all GPS satellites; Earth rotation parameters; contributions to the determination of the tracking site; coordinates in the International Terrestrial Reference Frame; and phase pseudorange observations in daily RINEX files for each IGS tracking site. Tracking data are available at various data centers, with the individual orbits determined by analysis centers at the global data centers, and the combined official IGS orbits at the Central Bureau and the global data centers.
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