File:   00readme

This directory /pub/slr/products contains analysis products
that have been generated by the ILRS analysis centers (AC)and combination centers (CC). 
In particular:
- the subdirectory "ilrs2014_individual_ac_sinex" contains the solutions 
for station coordinates and Earth Orientation Parameters (EOPs), that were 
submitted by each ILRS AC and used by the CC in the development of the 
official COMBINED ILRS product that was delivered to ITRS 
for the development of ITRF2014. 
- the subdirectory "itrf2014" contains the COMBINED ILRS solution time series 
for station coordinates and Earth Orientation Parameters (EOPs) that 
was delivered to ITRS for the development of ITRF2014. 
- the subdirectory "pos+eop" contains the operational solutions for station
coordinates and Earth Orientation Parameters (EOPs). 

These are ILRS loosely constrained solutions (i.e. their reference frame 
has an arbitrary orientation) for station coordinates
(valid for the mid-point of each 7/15-day interval) and EOPs (x-pole,
y-pole and Length-Of-Day--LOD, for 1/3-day intervals).

The official primary ILRS combination products are formed by ASI 
Space Geodesy Center. The ILRS's official backup combination center 
is the Goddard Earth Science and Technology Center (GEST/UMBC). 

These results are stored in subdirectories "YYMMDD",
where "YYMMDD" is the date (YY=2 digit year, MM=2 digit month, and
DD=2 digit day) of the end of each 7/15-day interval. 
Within each subdirectory, one finds so-called individual solutions and/or 
combination solutions, using the following naming convention:

 CENTER.pos+eop.YYMMDD.vN.snx (site coordinates and EOP loosely constrained)
 CENTER.pos+eop.YYMMDD.vN.sum (summary file)
 CENTER.eop.YYMMDD.vN.snx (EOP in the ITRF, for operational product only)

Here, "CENTER" is replaced by either "ilrsa", or "ilrsb", or the 
abbreviated name of the analysis center. The version number "N" for 
first solution that is generated. 
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. More information on the
ILRS products can be found at:

   http://ilrs.gsfc.nasa.gov/products_formats_procedures/products.html

For more information and/or suggestions, please contact the CDDIS/EDC
Data Center representatives (Carey Noll, carey.noll@nasa.gov and
Christian Schwatke, christian.schwatke@tum.de) or the ILRS Analysis 
representatives, Erricos C. Pavlis <epavlis@umbc.edu> and Cinzia Luceri 
<cinzia.luceri@e-geos.it>.