The "International Laser Ranging Service" (ILRS) operates two global data and operations centers, the EUROLAS Data Center (EDC) at the DGFI and the "Crustal Dynamics Data Information Center" (CDDIS) of NASA. The tasks of data centers is the collection and supply of all SLR observation data, derived products and all additional information which are necessary for the proper operation of the SLR stations. The operation centers are responsible for quality assurance of the data and some formal format conversions. All data and products are free available on the FTP of the EDC (ftp://edc.dgfi.badw.de). In addition, an interface to check their own data format is provided. The website of the UROLAS Data Center (EDC) is available unter edc.dgfi.badw.de which provides more information about SLR observations and derived products.
The two data centers keep, as a mutual assurance, identical data sets, which are compared at short intervals. This increases the access security in the event of network or hardware failures. Only direct contact with the SLR stations is divided between the two centers, where the EDC attend to the EUROLAS- the "Western Pacific Laser Tracking Network" (WLTPN) network (see figure). The data processing is fully automatic, so that there are only slight delays between data acquisition and delivery of products.