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ILRS Home  Data & Products Official ILRS Products
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ILRS Products
Official ILRS products consist of solutions for station coordinates and Earth Orientation Parameters (EOPs). The ILRS generates weekly, unconstrained solutions for station coordinates (valid for the mid-point of each 7-day interval) and EOPs (x-pole, y-pole and Length-Of-Day (LOD), all at 1-day intervals). A description of the analysis can be found at http://ilrs.gsfc.nasa.gov/products_formats_procedures/ilrs_products_desc.html. These results are stored in subdirectories "pos+eop/YYMMDD", where "YYMMDD" is the date (YY=2 digit year, MM=2 digit month, and DD=2 digit day) of the end of each 7-day interval. Within each subdirectory, are the solutions from the combination centers and individual analysis centers.
| Solution end date, gps week, and data location | combination solution * | analysis center contributions | |||||||||||||||
| asi | bkg | dgfi | ga | gfz | jcet | ngsf | |||||||||||
| 20110625 1641 |
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snx | snx | n/a | snx | snx | snx | snx | snx | snx | ||||||
| 20110618 1640 |
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snx | snx | n/a | snx | snx | snx | snx | snx | snx | ||||||
| 20110604 1638 |
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snx | snx | n/a | snx | snx | snx | snx | snx | n/a | ||||||
| 20110528 1637 |
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snx | snx | n/a | snx | snx | snx | snx | snx | snx | ||||||
| * | pos+eop: | SUMmary file assessing the quality of solution and a SiNeX format solution file for combination POSition and Earth Orientation Parameter solution |
| eop: | a SiNeX format solution file for the EOP combination product |
The official primary ILRS combination products are formed by ASI Space Geodesy Center. The ILRS's official backup combination center is Joint Center for Earth Systems Technology (JCET). The combination products, and the individual ILRS analysis center contributions to the official combination pos+eop and eop product can be downloaded from the ILRS ftp archive labeled as:
ftp://cddis.gsfc.nasa.gov/pub/pub/slr/products/pos+eop/ YYMMDD/CENTER.pos+eop.YYMMDD.vN.sum
ftp://cddis.gsfc.nasa.gov/pub/pub/slr/products/pos+eop/ YYMMDD/CENTER.pos+eop.YYMMDD.vN.snx
ftp://cddis.gsfc.nasa.gov/pub/pub/slr/products/pos+eop/ YYMMDD/CENTER.eop.YYMMDD.vN.snx
Here, "CENTER" is replaced by either "ilrsa", or "ilrsb", or the abreviated name of the analysis center. The version number "N" for first solution that is generated for this period is labeled as "1". If re-computations are necessary, the version number, "N", will be increased by one. The results are stored in the SINEX format (".snx"). The reader is refered to the COMMENTS section of each solution (in the file itself) or more general explanations of SINEX for further details of the solution and/or the format.
The individual analysis center solutions as well as the combination solutions are monitored on a weekly basis with a graphical and a statistical presentation of these time series available at: site hosted by the JCET analysis center http://geodesy.jcet.umbc.edu/ILRS_QCQA .
For more information and/or suggestions, please contact the CDDIS/EDC Data Center representatives (Carey Noll or Christian Schwatke respectively) or the ILRS Analysis Coordinators (Erricos Pavlis or Cinzia Luceri).
NOTICE: It is important that you acknowledge the ILRS in your papers and presentations that rely on SLR and results. Please reference the following citation:
Pearlman, M.R., Degnan, J.J., and Bosworth, J.M., "The International Laser Ranging Service", Advances in Space Research, Vol. 30, No. 2, pp. 135-143, July 2002.
Furthermore, please include SLR as a keyword in your papers. The SLR community relies on these acknowledgements and references to strengthen its requests for continued support from its funding organizations. The Central Bureau asks that you provide a link to and/or bibliographic reference of any SLR/LLR-related papers or presentations.
Responsible Government Official: Carey Noll
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