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NASA's Crustal Dynamics Data Information System archives daily 24-hour files of ground-based Global Navigation Satellite System observation data with a 30-second sampling rate. The dataset contains data primarily from GPS and GLONASS, and since 2011 includes data from Galileo, Beidou, QZSS, IRNSS, and SBASs. Files are stored in RINEX format, one per site, from a global permanent network of receivers.
License details are unclear; the datagov platform specifies 'other-license-specified', while nasa_earthdata lists 'None'. Users should consult the CDDIS website for specific usage terms.