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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))

Product Summary

Platforms
SATELLITES
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Geographic Region
GLOBAL
Coordinate System
GEODETIC
Granule Spatial Representation
GEODETIC
Temporal Extent
1983-01-01 to 2021-12-31
Data Partner
Crustal Dynamics Data Information System, Geodesy and Geophysics Laboratory, Earth Sciences Division, Sciences and Exploration Directorate, Goddard Space Flight Center, NASA (CDDIS)
Concept ID
c2409908432-cddis
Data State
COMPLETE
Processing Level
1

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

International Laser Ranging Service (ILRS), Italian Space Agency (ASI), German Federal Agency for Cartography and Geodesy (BKG), German Geodetic Research Institute (DGFI-TUM), German Research Centre for Geosciences (GFZ), Joint Center for Earth Systems Technology (JCET), U. of M. B. C. (U. M. B. C., & Natural Environment Research Council (NERC) Space Geodesy Facilities (NSGF). (2022). CDDIS_ SLR_products_ITRF2020_Station_Positions_and_Earth_Orientation_Parameters_Time Series_REPRO2020 [Data set]. NASA Crustal Dynamics Data Information System. https://doi.org/10.5067/SLR/SLR_ITRF20200_REPRO2020_001 Date Accessed: 2025-06-27

Data Center Citation

E. C. Pavlis (GESTAR II/UMBC & NASA Goddard 61A) and V. Luceri (e-GEOS S.p.A., ASI/CGS). The ILRS contribution to ITRF2020. . https://itrf.ign.fr/docs/solutions/itrf2020/The_ILRS_contribution_to_ITRF2020_description_2022.07.13.pdf.

File Naming Convention

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

Documents

GENERAL DOCUMENTATION URL for more information about SLR reference frame data

Learning Resources

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