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    • Supporting Information for Very Long Baseline Interferometry (VLBI) Data and Products from NASA CDDIS

    Metadata Updated: January 30, 2026

    Very Long Baseline Interferometry (VLBI) is a geometric technique: it measures the time difference between the arrival at two Earth-based antennas of a radio wavefront emitted by a distant quasar. VLBI precisely locates points on Earth by comparing radio signals from a quasar radio source located in deep space received at different times at different Earth ground stations. This method gives relative positions of the Earth stations. VLBI data can be used to calculate information on Earth rotation, length of day, polar motion, baseline and velocities of stations. Products generated by VLBI contribute to research in many areas, including solid Earth, tides, studies of the vertical, fundamental astronomy, and VLBI technique improvement. More information about these data and products are available on the CDDIS website at https://cddis.nasa.gov/Data_and_Derived_Products/VLBI/VLBI_data_and_product_archive.html.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date January 30, 2026

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date January 30, 2026
    Publisher CDDIS
    Maintainer
    Identifier C1708952717-CDDIS
    Data First Published 1979-01-01
    Language en-US
    Data Last Modified 2025-03-31
    Category IVS, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 89bdd352-4e0b-4af1-a00f-10759c6cffda
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://cmr.earthdata.nasa.gov:443/search/concepts/C1708952717-CDDIS.html
    Metadata Type geospatial
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash f1cbd554b84fd4da1947bcd9a78246a20eae8ade534e4bce4d1b68499d09257d
    Source Schema Version 1.1
    Temporal 1979-01-01T00:00:00Z/2024-11-11T00:00:00Z

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