Laser ranging data consist of a distance or range (round-trip, station to satellite and back) and time, together with data correction information such as atmospheric effects, which are to be applied to the data. Raw laser ranges are formatted at the remote station before transmission to operational data centers where the data are translated into the appropriate format.
The CDDIS serves as a global data center for the International Laser Ranging Service (ILRS). ILRS Operations Centers interface to SLR stations, collecting, validating, and merging data from selected stations. At a minimum, laser stations forward their data to operations/data centers on a daily basis where they are merged into files by day and satellite for transmission to and archive at the global data centers such as the CDDIS.
Products derived from SLR data are under development by the ILRS Analysis Working Group. These products include station positions and Earth orientation parameters (EOP) and are located on the CDDIS in subdirectories by data type at ftp://cddis.gsfc.nasa.gov/slr/products.