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

CDDIS VLBI TRF products, Greenbelt, MD, USA: NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/VLBI/vlbi_trf_products_001.

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 TRF products available from the Crustal Dynamics Data Information System (CDDIS)
  • Format: NGS Card
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 2002 - present
  • Temporal Resolution: quarterly
  • File Size: ∼500 KB to 500+MB
  • Platforms: Very Long Baseline Interferometry (VLBI)


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.

Data Access

CDDIS VLBI TRF products are online.

Starting directory:

as follows:


Code Meaning
AC_nameAnalysis Center name
YYYY4-digit year
X a, b, or c
gz gzipped file