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Global Navigation Satellite System (GNSS) data provides autonomous geo-spatial positioning with worldwide coverage from a network of permanent ground-based receivers. The dataset, managed by NASA's Crustal Dynamics Data Information System (CDDIS), includes hourly files of 30-second sampled observations, broadcast ephemeris, and meteorological messages in RINEX format. It archives data primarily from GPS and GLONASS, with additional systems like Galileo and Beidou added since 2011.
Data is provided in specialized formats (BIN, ISO, RINEX). License terms require review as they are specified as 'other-license-specified'.