NASA CDDIS provides Very Long Baseline Interferometry (VLBI) data and derived products. VLBI is a geometric technique that measures time differences in radio wavefronts from distant quasars received at Earth-based antennas. These measurements support research in solid Earth dynamics, tides, fundamental astronomy, and technique improvement.
Use Cases
- Modeling Earth rotation parameters based on precise time difference measurements.
- Calculating polar motion and length-of-day variations from baseline data.
- Determining relative positions and velocities of ground stations for geodetic networks.
- Improving VLBI technique and instrumentation based on historical performance data.
Strengths
- Data is produced by NASA's CDDIS, an authoritative source for space geodesy data.
- Supports multiple research areas including solid Earth, tides, and fundamental astronomy as stated in the description.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count and file size are unknown, which may limit suitability assessment.
- Last update date is unknown; freshness unverified.
Provenance
- Source
- NASA Crustal Dynamics Data Information System (CDDIS)
- Collection Method
- Very Long Baseline Interferometry measurements from Earth-based antennas receiving signals from distant quasars.
- Time Range
- null
- Freshness
- null
- Geography
- Global (Earth-based antenna stations)