The Crustal Dynamics Data Information System (CDDIS) was initially
developed to provide a central data bank for NASA's Crustal
Dynamics Project (CDP). The system continues to support the
space geodesy and geodynamics community through NASA's Space
Geodesy Program as well as NASA's Earth
Science Enterprise. The CDDIS was established in 1982 as a
dedicated data bank to archive and distribute space geodesy related
data sets. Today, the CDDIS archives and distributes mainly Global
Navigation Satellite Systems (GNSS, currently Global Positioning
System GPS and GLObal NAvigation Satellite System GLONASS), laser
ranging (both to artificial satellites, SLR, and lunar, LLR), Very
Long Baseline Interferometry (VLBI), and Doppler Orbitography and
Radio-positioning Integrated by Satellite (DORIS) data for an ever
increasing user community of geophysists.
The CDDIS is operational on a dedicated computer located at the Goddard
Space Flight Center in Greenbelt, MD. All NASA investigators,
staff, and cooperating institutions have access to the CDDIS computer
facility through Internet.
The CDDIS has served as a global data center for the International
GPS Service (IGS)
since 1992. The CDDIS supports the International Laser Ranging Service
the International VLBI Service for Geodesy and Astrometry (IVS),
the DORIS Pilot Experiment, a precursor to the International DORIS
Service (IDS), and
the International Earth Rotation Service (IERS) as a global data center.
To learn more about these space geodetic techniques and their respective
CDDIS data holdings, click on the images below.