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IGS data center links:

• Crustal Dynamics Data Information System (CDDIS) global data center, web/ftp
• Scripps Orbit and Permanent Array Center (SOPAC) global data center, web/ftp
• Institut Geographic National (IGN) global data center, web/ftp
• Korea Astronomy and Space Science Institute (KASI) global data center, web/ftp
• Bundesamt für Kartographie und Geodäsie (BKG) regional data center, web/ftp

IGS related links:

• International GNSS Service (IGS)
• Global Geodetic Observing System (GGOS)
• International Association of Geodesy (IAG)
• International Earth Rotation and Reference Systems Service (IERS)
• International Terrestrial Reference Frame (ITRF)
• International Union of Geodesy and Geophysics (IUGG)
• UNAVCO

Other links:

• GPS Seamless Archive Center (GSAC) (SIO, UNAVCO)
• Data compression software
• NASA Home Page
• GSFC Home Page
• JPL Home Page
• American Geophysical Union (AGU)