SLR monthly full-rate data


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 Laser Ranging Service (ILRS), SLR monthly full-rate data, Greenbelt, MD, USA:NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/SLR/slr_data_monthly_fr_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: SLR monthly full-rate data
  • Format: CRD, ILRS V2, ILRS V3
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 1976-01-01 to present
  • Temporal Resolution: Monthly
  • File Size: 300Mb
  • Platforms: See ILRS mission information


Full-rate data include all valid satellite returns and are thus larger in volume; these data are not routinely provided by all stations in the laser tracking network. Full-rate data are useful for both engineering evaluation and scientific applications (e.g., studying the performance of retroreflectors, discerning satellite signatures, understanding the statistical nature of satellite returns, calibration of satellite targets, validating system quality of laser station co-locations, etc.). Although many of these studies are of an engineering nature, the results have an important impact on the quality of the scientific output. Full-rate data are transmitted in daily files containing all data received in the previous 24-hour period. The CDDIS then updates monthly, satellite-specific files from these daily files.

CRD format started testing in 2008 and became operational in January 2011. ILRS/CSTG formats were used for full-rate data from 1976 through 2011.

Data Access

SLR monthly full-rate data files are online. The starting directory varies based on the CRD format version available. Differences between the versions are documented on the ILRS website at

in subdirectories by satellite name and year as follows:



Code Meaning
SATNAME Satellite name
YYYY4-digit year
V version of data (a, b, c, …)
YY 2-digit year
MM 2-digit month
.Z UNIX compressed file