NASA CDDIS GNSS Observation Data: 30-Second Sampling, Hourly Files

Hourly GNSS observation files from NASA's Crustal Dynamics Data Information System (CDDIS) provide 30-second sampling data from a global network of ground receivers. The data includes signals from the U.S. GPS, Russian GLONASS, and, since 2011, other systems like Galileo and Beidou. The files are stored in RINEX format and were last updated in March 2026.

Use Cases

• Modeling tectonic plate motion and crustal deformation based on precise ground station positioning.
• Analyzing Earth's rotation and polar motion based on long-term GNSS observation time series.
• Studying atmospheric conditions like ionospheric delay and tropospheric water vapor based on signal propagation data.
• Calibrating and validating satellite orbit models based on ground-based observation data.

Strengths

• Data originates from NASA's authoritative CDDIS archive, a primary source for geodetic data.
• Includes multi-GNSS signals (GPS, GLONASS, Galileo, Beidou, etc.) from a global network since 2011.
• Provides high-temporal-resolution data with 30-second sampling intervals in hourly files.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download from the RINEX format.
• Row count and total dataset size are unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the distribution of the global permanent receiver network.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS)

Collection Method

Collected from a global permanent network of ground-based GNSS receivers.

Time Range

Data collection includes records from at least 2011 onward, based on the description.

Freshness

Last updated 2026-03-13 01:36:02.159452; freshness should be verified.

Geography

Global coverage from a network of ground stations.