After February 16, 2023, the long name GNSS products archived at the CDDIS will follow the Guidelines for Long Product Filenames in the IGS version 2.0. These guidelines are available at For more information, please see IGSMail message 8309 sent February 3, 2023.

close window
CDDIS VLBI level 2 vgosDB format data

doi: 10.5067/VLBI/vlbi_L2_VGOSDB_001

Data Center Citation

Noll, Carey E., The Crustal Dynamics Data Information System: A resource to support scientific analysis using space geodesy, Advances in Space Research, Volume 45, Issue 12, 15 June 2010, Pages 1421-1440, ISSN 0273-1177,

Data Citation

International VLBI Service for Geodesy and Astrometry (IVS)CDDIS VLBI level 2 vgosDB format data [online]. Available from the NASA Crustal Dynamics Data Information System DAAC, Greenbelt, MD, USA at:, Accessed [[enter user data access date]].

Other standard citation formats may be used for this data set and can be found at the DOI Citation Formatter website.

More information about CDDIS data citations and acknowledgments is available.


  • Name: CDDIS VLBI level 2 vgosDB format data available from the Crustal Dynamics Data Information System (CDDIS)
  • Format: vgosDB
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 2017 - present
  • Temporal Resolution: Typically 24-hours for one VLBI session, can vary
  • File Size: Variable, from ∼ 50Kb to 50Mb
  • Platforms: Very Long Baseline Interferometry (VLBI)


This CDDIS collection is composed of geodetic, Very Long Baseline Array (VLBI) level 2 observational and supporing 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.

Data Access

The VLBI vgosDB data are online:

in subdirectories by year as follows:


Code Meaning
YYYY4-digit year
YY 2-digit year
MMM 3-character month (APR, AUG, etc.)
DD 2-digit day
XX 2-character designation indicating the particular session
.tgz gzipped tar file