1. IGS Workshop 2008, Miami Beach IGN activities as IGS data center The IGN Global Data Centre (GDC) has been designed and implemented in answer to both the Analysis Centers and the surveying user community requirements, for post-processing and real-time applications. The IGN data center is handled by the geodetic and levelling department (SGN). So as to have a more reliable data flow and a better availability of the service, two identical configurations have been setup in two different locations in IGN. Each configuration has : -FTP deposit server for data and analysis centers uploads, -FTP anonymous access to the GNSS observations and products, -Fully independent Internet links. The infrastructure is common with the National GNSS permanent network and IDS data center activities. Participation as GDC to the RTIGS Pilot Project

2. IGS Workshop 2008, Miami Beach IGN GDC : system overview

3. IGS Workshop 2008, Miami Beach IGN beginnings as « analysis center » Project launched in 2007: production of ultra-rapid orbits and 30s clocks Why ? –Rapid PPP (trajectography and validation of aerial photography flights) –Hourly troposphere estimations (E-GVAP) How ? –Bernese GPS Software 5.0 –Many improvements still needed, and then validation Results: –Products released every 2 hours since December 2007 –30s clocks not yet available –Comparison with IGU and IGS products: encouraging

4. IGS Workshop 2008, Miami Beach IGS ERP format MJD X-P Y-P UT1-UTC LOD S-X S-Y S-UT S-LD... 54621.08 129403 537317 -4308507 4153 6 8 6 12... Extract of file sgu14823_14.erp: = June 4 th, 2008 – 1h 55min 12sec !