International GNSS Service (IGS) is a voluntary federation of more than 200 worldwide agencies that pool resources and permanent GNSS station data to generate precise GNSS products. The IGS is committed to providing the highest quality data and products as the standard for global navigation satellite systems (GNSS) to support Earth science research, multidisciplinary applications, and education.

The Global Data Centers (GDC) are the main interface to the Analysis Centers and the user community. The GDCs archive and provide open access to IGS data and products.

IGS products include:

• 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

KASI GDC is the 1st IGS GDC in Asia and Oceania region. KASI GDC archives the data directly from Asia - Oceania and distributes all IGS data and products. KASI GDC also hosts new regional IGS stations and is participating inter-GDC redundancy and backup. For more information about our activities, please contact gnss@kasi.re.kr