17 Marel

EUREF TWG Meeting, Budapest, Hungary, March 22-23, 2004 COST-716, EUMETNET and  possible role of EUREF: 

EUREF TWG Meeting, Budapest, Hungary, March 22-23, 2004 COST-716, EUMETNET and possible role of EUREF Hans VAN DER MAREL, Elmar BROCKMANN Delft University of Technology, swisstopo Aerospace Engineering (DEOS/MGP) Wabern, Switzerland Netherlands

COST-716 Action: 

COST-716 Action Exploitation of Ground-Based GPS for Climate and Numerical Weather Prediction Applications for Europe Action in force September 1998 (duration 5 years) Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Hungary, Italy, Netherlands, Norway, Spain, Sweden, Switzerland and UK. 4 working groups: 1. State of the art…. 2. Demonstration project… 3. Applications… 4. Towards operational… Workshops: 1st Workshop 10-12 July, 2000, Oslo, Norway 2nd Workshop 28-29 January, 2002, Potsdam, Germany 3rd Workshop 1-3 December, 2003, De Bilt, Netherlands Action finished April 2004

NRT demonstra- tion : 

NRT demonstra- tion Started March 2001 Status March 2004: 420 stations 10 operational ACs: GFZ, GOPE, IEEC, ASI, LPT, NKG, NKGS, ACRI, SGN, BKG http://www.knmi.nl/samenw/cost716.html

NRT analysis centers: 

NRT analysis centers GPS analysis centers which contribute to the NRT demonstration are: ACRI ACRI Sciences de Terre, Valbonne, France ASI_ Agenzia Spaziale Italiana, Matera, Italy BKG_ Bundesamt für Kartographie und Geodäsie, Frankfurt, Germany GOPE Geodetic Observatory, Pecny, Czech Republic GFZ_ GeoForschungsZentrum, Potsdam, Germany IEEC IEEC, Barcelona, Spain LPT_ Federal Office of Topography, Wabern, Switzerland NKG_ Nordic Geodetic Commission - Statens Kartverk, Norway NKGS Nordic Geodetic Commission - Onsala Space Obs. Sweden SGN_ Institut Geographique National, Paris, France Different processing strategies and software are used

NRT GPS data providers: 

NRT GPS data providers GPS data providers which contribute to the NRT demonstration are: International GPS Service (IGS) EUREF Permanent GPS Network (EPN) National Mapping Agencies (OS,BKG,SAPOS,SWEPOS,NMA,LPT,…) National Meteorological Services (Met.Office, DWD, …) Universities and research networks Private companies GPS data collection is handled by the analysis centers: uses IGS and EPN data centers, completed with several local data centers, resulting in a dense network analysis centers often have access to unique sources of data which are otherwise not available to the public analysis independent from EPN and IGS

COST716 Data Flow: 

COST716 Data Flow AC’s compute ZTD (Zenith Total Delays) in hourly batches Download GPS data from various data providers (15 –20 min) Processing, each AC use different strategies/software (20-25 min) ZTD within 1h45m to UK Met Office in the COST format (ftp) Acts as a gateway to participating meteorological institutes Converted into BUFR format (used on the GTS) Operational since beginning of March 2004! ZTD data is filtered (only IGS, EPN and those stations w/ permission) Ftp-mirror at TUD/Delft (holds the full archive) The ZTD is converted to IWV at KNMI using Measured pressure and temperature at GPS site Pressure and temperature interpolated from nearby synoptic sites Displayed on the WWW; IWV data available by ftp http://www.knmi.nl/samenw/cost716.html The ZTD are used for NWP assimilation trials by WG/3

Number of COST 716 stations: 

Number of COST 716 stations

Delay for 75% of Observations to Arrive: 

Delay for 75% of Observations to Arrive

COST 716 conclusions: 

COST 716 conclusions Demonstration experiment exceeded expectations!! Shown to meet operational requirement in terms of timeliness and accuracy ZTD’s are used directly for NWP (no combination), must be available in 1h 45m (> 70% of the data) Timely available GPS data is essential for success on a continental or global scale (NRT reference network) on a local scale for the necessary density But improvenent still needed (gaps in network, reliability and latency) Slight positive impact in case of heavy precipitation Extremely valuable data for validation and monitoring New nowcasting applications

The way ahead…: 

The way ahead… Research continued within TOUGH project (2003-2006) EUMETNET project proposed at COST final workshop Organisation of National Meteorological Services Special project proposed to take actions to prepare the European GPS water vapour network to function operationally Proposal written by John Nash (Met.Office) 3 year project to be started in 2005 Organise a geodetic interface to the EUMETNET project*) Task given to Hans van der Marel, Elmar Brockmann, Hans-Peter Plag and Gerd Gendt by the COST 716 MC Suggested to contact EUREF and IGS first Letter of COST 716 chair to EUREF/TWG chair *) the mandate is a liitle broader: the complete meteorological community

TOUGH: 

TOUGH Targeting Optimal Use of GPS Humidity Measurements in Meteorology Shared-cost project co-funded by EU (5th framework programme) Objectives Optimise assimilation of GPS ZTD into NWP Methods for derivation and use of GPS slant delays Run a research mode data collection (cont’ of COST 716) Investigate benefit of using GPS-data into NWP Partners: Met.Services: DMI (DK), SMHI (SE), Met Office (UK), INM (ES), KNMI (NL), FMI (F) Analysis Centers: ACRI-ST (F), Chalmers (SE), NMA (N), ASI (I), IEEC (ES), Swiss Topo (CH), GOP (CZ) Universities: L’Aquila (I), Delft (NL) and Purdue (US) Started February 2003 and runs through January 2006

EUMETNET (E-GVAP) Objectives: 

EUMETNET (E-GVAP) Objectives Take actions to prepare and coordinate future operational processing of GPS water vapour on both European and national scales Transfer from research funding to operational service as fas as possible in liaison with the geodetic community Suitable standards for processing will be agreed with the geodetic GPS community (incl. naming) Establish a data hub for GPS ZTD and quality monitoring facility Activities will be designed to improve meteorological collaboration with operators of national GPS sensor networks, by sharing facilities for reducing operational costs by providing feedback of meteorological data Liaise with geodetic data processing centers to establish a long term policy for processing operational GPS water vapour measurements, and to co-ordinate national/regional processing efforts to ensure availability of data from the whole of Europe Promote methods of introducing the use of GPS water vapour measurements to operational meteorologists

EUMETNET (E-GVAP) Organisation: 

EUMETNET (E-GVAP) Organisation Run by a responsible member providing a PM Operational liaison group to manage interaction with the wider GPS sensing community Expert team on data processing and standards Expert team on promoting the use of the observations Financial costs per year PM 30k Liason group meetings 15k Expert team meetings 10k Contract to support hub/central processing 30k Project travel 10k

Potential benefits for GPS community: 

Potential benefits for GPS community Cost sharing Common stations Communications NRT quality monitoring hub Use of meteorological products Pressure for atmospheric loading effects Pressure to compute a-priori ZTD for GPS processing Mapping functions from numerical weather models Atmospheric delay corrections for Network RTK Use of meteorological services Calibration of pressure sensors Management of meteo equipment at GPS sites by NMS

What could be EUREF’s role?: 

What could be EUREF’s role? Several areas of shared interest have been identified Possible benefits for EUREF and the contributing partners EUREF has been progressing as well EUREF is already going towards (Near) Real-time EUREF is already “densifying” (Certification initiative) EUREF is becoming the reference for GPS in Europe at large, implicit and explicit standardization Should there be a role for EUREF?, how to do it? EUREF TWG could play a coordinating role and liaise with the analysis centers (Special WG? Troposphere WG? role of AC workshops?) At the symposium most of the major GPS providers (NMA, others) are represented Open for discussion