Crustal Dynamics Data Information System (CDDIS)
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), and
- Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)

Contact Information
Dr. Patrick Michael, DAAC Manager
Rebecca Limbacher, DAAC Operations Lead
James Roark, DAAC Systems Engineer
Lori Tyahla, User Services
NASA GSFC
Code 61A
Greenbelt, MD 20771
Geodesy Data
CDDIS also provides products derived from these data required for a variety of science observations, including the determination of a global terrestrial reference frame and geodetic studies in plate tectonics, earthquake displacements, volcano monitoring, Earth orientation, and atmospheric angular momentum, among others.
Users can access the data and products available through CDDIS via https and encrypted FTP.
Access the Earthdata Forum for questions and answers on geodesy data.
Links
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Webinar: Accessing Real-Time GNSS Data and Derived Products from NASA CDDIS
Learn how to discover and access the real-time Global Navigation Satellite System (GNSS) data.
Page Last Updated: Nov 23, 2021 at 10:32 AM EST