Crustal Dynamics Data Information System (CDDIS)
The CDDIS is NASA’s data archive and information service supporting the international space geodesy community. For over 25 years, the CDDIS has provided continuous, long term, public access to the data (mainly GNSS-Global Navigation Satellite System, laser ranging, VLBI-Very Long Baseline Interferometry, and DORIS-Doppler Orbitography and Radiopositioning Integrated by Satellite) and 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. The specialized nature of the CDDIS lends itself well to enhancement to accommodate diverse data sets and user requirements. The CDDIS serves as one of the primary data centers and 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.
Users can access the data and products available through the CDDIS via anonymous ftp (see below).
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. Courtesy: CDDIS
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