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

IGS Workshop 2008, Miami Beach

IGN GDC : system overview

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

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 4th, 2008 – 1h 55min 12sec !