Crustal Dynamics Data Information System (CDDIS)

Disciplines: Space geodesy
The figure illustrates the global networks of geodetic sites which consist of 440 GNSS receivers, 44 laser ranging sites, 45 VLBI stations, and 58 DORIS sites and provides the means of determining an accurate and global Terrestrial Reference Frame. 

NASA's Crustal Dynamics Data Information System (CDDIS) is NASA’s data archive and information service supporting the international space geodesy community. CDDIS is part of the Earth Sciences Division at NASA's Goddard Space Flight Center in Greenbelt, MD. CDDIS serves as one of the core components for the geometric services established under the International Association of Geodesy (IAG), an organization that promotes scientific cooperation and research in geodesy on a global scale. CDDIS provides continuous, long term, public access to the data and derived products from a global network of observing stations equipped with one or more of the following measurement techniques:

  • Global Navigation Satellite System (GNSS)
  • Satellite Laser Ranging (SLR)
  • Lunar Laser Ranging (LLR)
  • Very Long Baseline Interferometry (VLBI)
  • Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)

Contact Information

Dr. Patrick Michael, DAAC Manager
Sandra Blevins, DAAC Deputy Manager
Rebecca Limbacher, DAAC Operations Lead
James Roark, DAAC Systems Engineer
Lori Tyahla, DAAC User Services 

NASA Goddard Space Flight Center (GSFC)
Code 61A
Greenbelt, MD 20771


Last Updated
Aug 11, 2021

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