doi: 10.5067/SLR/slrf2020_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,

Noll, C. E., Ricklefs, R., Horvath, J. et al. Information resources supporting scientific research for the international laser ranging service, Journal of Geodesy, Volume 93, Issue 11, February 2020, Pages 2211–2225,

Analysis Center Citation

The individual SLR solutions that contributed to the ITRF2020 combination product were computed by the following official International Laser Ranging Service (ILRS) Analysis Centers (listed in alphabetical order of their acronym identifier) using the Satellite Laser Ranging (SLR) data obtained from the LAGEOS, LAGEOS-2, Etalon-1, and Etalon-2 satellites. The combined solution was generated by ITRS CC/Paris including the corresponding products from the other techniques, IVS, IGS and IDS, resulting in the ITRF2020 combination product which was the basis for the development of SLRF2020. SLRF2020 was generated by the official ILRS Combination Center hosted by JCET/GSFC at Univ. of Maryland, Baltimore County (UMBC).

  • Italian Space Agency (ASI)
  • German Federal Agency for Cartography and Geodesy (BKG)
  • German Geodetic Research Institute (DGFI-TUM)
  • European Space Agency (ESA)
  • German Research Centre for Geosciences (GFZ)
  • Joint Center for Earth Systems Technology (JCET), University of Maryland Baltimore County (UMBC)
  • Natural Environment Research Council (NERC) Space Geodesy Facilities (NSGF)

Data Citation

SLRF2020 product, Greenbelt, MD, USA: NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/SLR/slrf2020_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: SLRF2020
  • Format: SINEX (hybrid)
  • Spatial Coverage: 90.0N to -90.0S, 180.0E to -180.0W
  • Temporal Coverage: May 1976 to July 2023
  • Temporal Resolution: N/A
  • File Size: 172 KB
  • Platforms: N/A


Expanded set of SLR station positions and velocities in the ITRF2020 frame, includes historical sites NOT part of ITRF2020 and some very recently installed sites that came online in 2022. A small number of sites require special treatment with the addition of corrections to their "mean" positions (in this file) from the ITRS-distributed PSD model, due to "events" (e.g. earthquakes) or changes at the site. Users must apply these corrections cumulatively, to the linearly propagated positions from this file, by themselves. For more details, s/w and relevant correction files please visit the official ITRS site on ITRF2020 at:


Data Access

The SLRF2020 product is online: