Very Long Baseline Interferometry (VLBI) Tropospheric Parameters (TROP) products from NASA CDDIS

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Troposphere Zenith Path Delay (ZPD) values derived from analysis of Very Long Baseline Interferometry (VLBI) data. These products are the generated by analysis centers in support of the International VLBI Service for Geodesy and Astrometry (IVS).

CDDIS GNSS products troposphere

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Troposphere Zenith Path Delay (ZPD) values by site derived from analysis of Global Navigation Satellite System (GNSS) data. These products are the generated by analysis centers in support of the International GNSS Service (IGS) and combined by the IGS troposphere analysis coordinator to form the official IGS troposphere product (daily).

Very Long Baseline Interferometry (VLBI) Level 1A correlator (SWIN) output from NASA CDDIS

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SWIN files contain the VLBI fringe visibilities of an observing session (24 hours long or 1 hour long). The files are created by the International VLBI Service for Geodesy and Astrometry (IVS) correlation centers and constitute the raw output of the Distributed FX-style (DiFX) software correlator running on a Swinburne supercomputer. These data form the basis for the fringe fitting process and can also be used to make source maps of the observed quasars.

Very Long Baseline Interferometry (VLBI) Level 2 VLBI Global Observing System (VGOS) DB format data from NASA CDDIS

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This CDDIS collection is composed of geodetic, Very Long Baseline Array (VLBI) level 2 observational and supporting data (including observations, standard deviations, station coordinates, and more) and derived products which are stored and exchanged in a format named vgosDB, which is the International VLBI Service for Geodesy and Astrometry (IVS) standard format for storing, transmitting, and archiving VLBI data. vgosDB datasets are comprised of NetCDF and ASCII files which contain almost all the information that is required to process a single VLBI session (typically 24-hours of data per single session).

Very Long Baseline Interferometry (VLBI) Terrestrial Reference Frame (TRF) products from NASA CDDIS

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Terrestrial Reference Frame (TRF) product derived from the analysis of Very Long Baseline Interferometry (VLBI) data. The Terrestrial Reference Frame product includes station positions, velocities, and correlations. A minimum of three years of data are used in each solution. The TRF operational product is available quarterly at International VLBI Service for Geodesy and Astrometry (IVS) Data Centers.

Global Very Long Baseline Interferometry (VLBI) Terrestrial Reference Frame (TRF) solution products from NASA CDDIS

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The Terrestrial Reference Frame product consists of a set of station positions, velocities, and correlations. A minimum of three years of data is used in each solution. The TRF operational product is available on the IVS Data Centers approximately quarterly.

CDDIS VLBI products positions

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Station positions and velocity solutions in Software INdependent EXchange (SINEX) format derived from analysis of Very Long Baseline Interferometry (VLBI) data. These products are the generated by analysis centers in support of the International VLBI Service for Geodesy and Astrometry (IVS) and combined by the IVS analysis coordinator to form the official IVS station position product.

Very Long Baseline Interferometry (VLBI) DB data from NASA CDDIS

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Very Long Baseline Interferometry (VLBI) binary files provided by the International VLBI Service for Geodesy and Astrometry (IVS) in vgosDB format.

Very Long Baseline Interferometry (VLBI) Daily SINEX Independent Solution product (DSNX) from NASA CDDIS

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The daily solution files are an analysis product that provides estimates of Earth orientation and site positions for each 24-hour session, the covariance matrix of the estimates, and decomposed normal equations. The solution files are in SINEX format. The SINEX product files are available on the same frequency as the EOP-S products: 24 hours after each new session data base is available.

Very Long Baseline Interferometry (VLBI) Celestial Reference Frame (CRF) solution products from NASA CDDIS

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Celestial Reference Frame (CRF) product derived from analysis of Very Long Baseline Interferometry (VLBI) data. These products are the generated by analysis centers in support of the International VLBI Service for Geodesy and Astrometry (IVS) and combined by the IVS analysis coordinator to form the official IVS CRF product.