GNSS Observation Summary: Daily 30-Second Satellite Data from Global Ground Network

NASA's CDDIS provides daily files of 30-second sampled Global Navigation Satellite System (GNSS) observation summaries from a permanent global network of ground receivers. Since 2011, the archive has expanded beyond GPS and GLONASS to include data from Galileo, Beidou, QZSS, IRNSS, and SBAS. These RINEX-format files contain all distinct navigation messages received per site per day, supporting precise positioning and Earth science research.

Use Cases

• Monitoring crustal motion and plate tectonics based on precise GNSS positioning data.
• Studying Earth's rotational variations and gravitational field using time-series satellite orbit data.
• Calibrating satellite-based augmentation systems (SBAS) with multi-GNSS broadcast ephemeris.
• Validating global coordinate reference systems using data from a permanent ground receiver network.

Strengths

• Data originates from the authoritative NASA Crustal Dynamics Data Information System (CDDIS).
• Includes multi-GNSS constellations (GPS, GLONASS, Galileo, Beidou, etc.) since 2011, providing global system coverage.
• Provides high-temporal-resolution data with a 30-second sampling rate.

Limitations

• Specific column names, row counts, and file sizes are not provided in the available metadata.
• One source lists a license as 'other-license-specified' while another lists 'None', indicating a conflict or lack of clarity on usage terms.
• Metadata completeness is medium; detailed schema and precise data collection methodology are not described.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS)

Collection Method

Collected from a global permanent network of ground-based GNSS receivers, processed with TEQC (translation, editing, and quality check).

Time Range

Data collection spans from at least 2011 to present, given the inclusion of multi-GNSS data from that year.

Freshness

Last updated on 2026-04-10 according to two platforms.

Geography

Global coverage from a network of ground-based receivers.