VLBI Earth Orientation and Terrestrial Reference Frame Products

Derived data products from Very Long Baseline Interferometry (VLBI) experiments provide Earth Orientation Parameters (EOP) and Terrestrial Reference Frame (TRF) solutions. The EOP products include intensive 1-hour UT1 sessions with a minimum of one year of data, while TRF products use a minimum of three years of data for station positions and velocities. These operational products are generated by analysis centers of the International VLBI Service for Geodesy and Astrometry (IVS) and archived by NASA's CDDIS.

Use Cases

• Analyzing short-term Universal Time (UT1) variations from 1-hour intensive VLBI sessions.
• Modeling long-term station positions and velocities from Terrestrial Reference Frame (TRF) solutions.
• Studying correlations between station coordinates provided in the TRF product.
• Monitoring operational Earth orientation parameters available within 24 hours of data acquisition.

Strengths

• Products are derived from the precise measurement technique of Very Long Baseline Interferometry (VLBI).
• EOP solutions are available operationally within 24 hours after Intensive data acquisition.
• TRF solutions incorporate a minimum of three years of data for stability.
• Dataset is hosted by NASA's CDDIS and available across multiple authoritative platforms.

Limitations

• Specific column names, row counts, and dataset sizes are not provided by any source.
• Sources conflict on license information, with some specifying 'other-license-specified' and others listing 'None'.
• The temporal coverage range (start and end dates) is not explicitly stated.

Provenance

Source

International VLBI Service for Geodesy and Astrometry (IVS) analysis centers, archived by NASA's Crustal Dynamics Data Information System (CDDIS).

Collection Method

Derived from the analysis of Very Long Baseline Interferometry (VLBI) observations.

Time Range

Minimum of one year of data for EOP products; minimum of three years for TRF products. Specific date range not provided.

Freshness

2026-03-12 20:24:06.950727

Geography

Global, based on the network of VLBI stations.