1. GPS Network: Status GFZ
Galina Dick, Markus Ramatschi
GeoForschungsZentrum Potsdam, Germany
5th COPS Workshop
March 2007
University of Hohenheim, Stuttgart

2. COPS-GPS Analysis Center at GFZ Potsdam
GPS-derived products available at COPS Data Center since January 1, 2007
Main product: NRT ZTD/IWV of ~ 200 sites
Time resolution: 15 minutes
Product delay: < 1.45 min
Quality: < 1-2 mm IWV
Additional: ‚slant delays‘, post-processed

3. Water Vapor Monitoring (Web Page GFZ)
Time series (last 2 or 7 days)
Animation (selected time interval)
Comparison to
‘Local Model’ of DWD

4. Supersites and planned location of GFZ GPS sites
USA: routine impact studies for several years now
Japan: no NRT, in preparation, interesting case studies with this very dense network
IGS global frame

5. 1) GPS site on SS (M): AMF Murg Valley, Heselbach (GFZ0)
Status: site is ready
Hourly data transfer to GFZ since 20th of March
Meteo station installed
IWV products will be available after the WS
USA: routine impact studies for several years now
Japan: no NRT, in preparation, interesting case studies with this very dense network
IGS global frame

6. 2) GPS site on SS (H): Hornisgrinde (GFZ1)
Status: site is in preparation
Antenna installed
Receiver/Meteo station will be installed as soon as power supply and Internet will be available (April)
USA: routine impact studies for several years now
Japan: no NRT, in preparation, interesting case studies with this very dense network
IGS global frame

7. 3) GPS site on SS (R): Rhine Valley, Achern (GFZ2)
Status: site is in preparation
Installation in April as soon as infrastructure will be available (container, power supply, Internet)
USA: routine impact studies for several years now
Japan: no NRT, in preparation, interesting case studies with this very dense network
IGS global frame

8. 4) GPS site on SS (S): Airport Deckenpfronn (GFZ3)
Status: site is in preparation
Installation in May as soon as infrastructure will be available (container, power supply, Internet)
USA: routine impact studies for several years now
Japan: no NRT, in preparation, interesting case studies with this very dense network
IGS global frame

9. Outlook Plans: Location of the 5th GPS site of GFZ should be discussed
GFZ analysis network extension to more than 250 sites
GPS data processing for all available sites during GOP/IOP
Assimilation experiments over longer time periods and the subjective and statistical evaluation of the resulting forecasts, with a focus on the precipitation, are required and planned to assess the impact of GPS data. To have the most benefit from a parallel run with GPS all modeling problems should be investigated in more details and possibly corrected before. Otherwise a negative impact may be obtained which will not demonstrate the real potential of the GPS.