Acknowledgements

The SISTED and GSFLAI NRT products use dual-frequency GPS data provided as NTRIP streams by the International GNSS Service (IGS, http://www.igs.org) and the EUREF network (EUREF, http://www.euref.eu ). For data collection and processing the open source routines provided by the Bundesamt für Kartografie und Geodäsie (http://igs.bkg.bund.de) and by the UNAVCO consortium (http://www.unavco.org) have been used. The MONITOR project, where SISTED and GSFLAI products are available for post analysis, is funded by the ESA's GNSS Evolutions Programme (EGEP).