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CDDIS: NASA's Archive of Space Geodesy Data
SLR products ITRF2020 Station Positions and Earth Orientation Parameters Time Series (REPRO2020)

doi: 10.5067/SLR/slr_itrf20200_repro2020_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, http://dx.doi.org/10.1016/j.asr.2010.01.018.

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, https://doi.org/10.1007/s00190-018-1207-2.

Analysis Center Citation

The individual solutions that comprise the REPRO2020 products 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 solutions of the REPRO2020 products were generated by the official ILRS Combination Center hosted by ASI and e-GEOS at CGS, Matera, Italy.

  • 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

SLR product Contribution to ITRF2020: Station Positions and Earth Orientation Parameters Time Series (REPRO2020) , Greenbelt, MD, USA: NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/SLR/slr_itrf20200_repro2020_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.

Summary

  • Name: SLR product Contribution to ITRF2020: Station Positions and Earth Orientation Parameters Time Series (REPRO2020)
  • Format: SINEX
  • Spatial Coverage: 90.0N to -90.0S, 180.0E to -180.0W
  • Temporal Coverage: 1983 - 2021
  • Temporal Resolution: Weekly and bi-weekly
  • File Size: 50 KB
  • Platforms: LAGEOS-1, LAGEOS-2, Etalon-1, Etalon-2

Description*

"The ILRS contribution to ITRF2020 consists of a pair of time series of weekly and bi-weekly station position estimates along with daily and 3-day averaged Earth Orientation Parameters (X-pole, Y-pole and excess Length-Of-Day (LOD)) estimated over 7-day arcs (1993.0 – 2021.0) and 15-day arcs for the period 1983.0-1993.0, aligned to the calendar weeks (Sunday to Saturday), starting from January 1983. Each solution is obtained through the combination of loosely constrained weekly/biweekly solutions submitted by each of the seven official ILRS Analysis Centers. Both, the individual and combined solutions have followed strict standards agreed upon within the ILRS Analysis Standing Committee (ASC) to provide ITRS products of the highest possible quality." (The ILRS contribution to ITRF2020, E. C. Pavlis (GESTAR II/UMBC & NASA Goddard 61A) and V. Luceri (e-GEOS S.p.A., ASI/CGS)) NOTE: yymmdd in the filenames refers to the last day of the week.

* Reference

Data Access

The SLR products Contributed to ITRF2020 Station Positions and Earth Orientation Parameters Time Series (REPRO2020) are online:

in subdirectories day of year as follows:

yymmdd/ilrsa.pos+eop. yymmdd.v40x.snx.gz

Code Meaning
yy2-digit year
mm 2-digit month
dd 2-digit day
x part of version number, 0-9
.gz Compressed file

The combined ILRSA solutions that contributed to the ITRF2020 realization are in subdirectories based on the year, month, and day as follows:

ac/yymmdd/ac.pos+eop.yymmdd.v40x.snx.gz

Code Meaning
acAnalysis Center Code
yy2-digit year
mm 2-digit month
dd 2-digit day
x part of version number, 0-9
.gz Compressed file

Documentation

http://cddis.nasa.gov/Data_and_Derived_Products/SLR/Reference_frame.html