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Chart-o-Mat
ICG-WIGOS TT on Metadata
Management of Station Metadata
at Deutscher Wetterdienst (DWD)
Rainer MärzSection Administration of Observing Networks
Geneva, March 11, 2013
Principles for Metadata at DWDPrinciples for Metadata at DWD
Metadata is stored together with observing data in one database
Project ‚MIRAKEL‘ started around 1995 for CDC + GPCC
All conditions are valid for a specific time-range (from – until)
Integration of Metadata from other organisations
Flexible Import/Export for future needs
Semi-automatic update and quality checking procedures
All applications should benefit from the data (and use it)
Geneva, March 11, 2013
Amount of station Metadata Amount of station Metadata
Overview of the contents [count of largest categories in thousands]:
WMO Main Stations (GSN, RBSN, RBCN ….) 13.000
Airports (with ICAO loc.ind.) reporting METAR/SPECI 5.000
German additional stations (voluntary, federal states) 12.000
Related partners (roads, renewable energy ….) 2.000
Voluntary observing ships and other marine vessels 9.000
Additional GPCC stations of all countries 75.000
Currently counting over all: 117.000
Geneva, March 11, 2013
Storage of Metadata / groups of tables Storage of Metadata / groups of tables
Tables for metadata divided into :
Basic Information meta tables; allowed values
Joined Information intersection tables with validity dates (begin / end)
Tables for observation data use the same unique station ID !
Staff
Mea
surin
g co
ndid
ions
Station
Pub
9Vol
A
Equipment
Geneva, March 11, 2013
Storage of Metadata / classes of informationStorage of Metadata / classes of informationMain aspects of meta data storage:
Main station table (name, start_date, end_date, status)
IDs (WMO / ICAO / IATA / GPCC / Nat.Numbers …)
Geographical (Lat./Lon., elevation, country, region, area etc.)
Equipment
Staff
Operation and Production (programmes for encoding reports)
Visits (Maintenance, Administrative)
Representation (measuring conditions)
Geneva, March 11, 2013
Managing the MetadataManaging the Metadata
Access and permits managed by database-roles
4 accounts with full access - ‚Admin‘
10+ accounts to maintain general station changes (add, move, close)
Approx. 100 accounts allow a ‚restricted write-access‘
Approx. 1000 accounts have only read-permits (all users)
Personalized data like bank accounts with restricted roles
Geneva, March 11, 2013
Updating and completing the Metadata Updating and completing the Metadata
Weekly import of Pub9VolA of WMO and semi-automatic changes
Regional Network Groups report national changes to Offenbachand edit their local entries (persons, sensors, visits, history)
Import of bilateral exchanged data with individual loading-procedures
comparision with other sources when necessary (flagging of suspicious/unknown/inconsistent)
GPCC maintains meta-data for non-WMO stations of other NMCs
Geneva, March 11, 2013
Typical trouble with metadataTypical trouble with metadata
No information about changes at a station
Inconsistency between dependent sources (i.e. elevation…)
Lack of syncronization with Offline-procedures
Especially Lat./Lon. different various formats (dez.,°,min/sec)
4 sources / 5 different values ;-) …. Which is ‚the best‘
Representation of a complicated history for a time-series
standard exchange format + automated process is necessary!
Geneva, March 11, 2013
Stations operated by Deutscher Wetterdienst 4 Regional Oberserving Network Groups
Hamburg, Potsdam, Offenbach, Munich
65 Stations with professional Observers, 35 occupied 00-24 UTC, 30 only daytime48 measuring radioactivity (air+precipitation)
28 RBSN Stations 11 Climate Reference (traditional equipment)
4 GSN-Stations (GCOS) 1 GUAN Station 1 GAW Station
114 Automated Weather Stations with full equipment
17 Weather Radar Stations
9 Aerological Stations (4 autolaunchers, 1 ozone)
4 Wind Profilers
+34 Stations of Bundeswehr Geoinfo Service
Geneva, March 11, 2013
Additional Stations operated by DWD and Partners
1781 Voluntary Stations (climate; wind; precip), 1365 reporting online (24/1 reports per day)
Ship-based:
740 Voluntary Observing Ships (VOS)
19 Ship (AWS) (24 reports/day)
Last but not least …:
1292 Phenological Stations (observing plants)
1500 Partner stations (approx) (motorways, fed.states, wind-energy, (nuclear) power-plants, university, military)
Geneva, March 11, 2013
All 1018 GSN stations in WMO GCOS
Basic Meta Data and availability of FM12/FM94 observations received in Offenbach
Example
Geneva, March 11, 2013
Example
Precip-Stationand the surroundingpresented in a toolof GPCC called
‚Mirakel-Live‘
There is still a lot of research necessary!
Geneva, March 11, 2013
Outlook Outlook
WCDMP / Data rescue needs support (DARE @ CDC) national projects currently in progress:
-> KliDaDigi for land stations -> HISTOR for ship logbooks
Lots of undigitalized metadata from all German Stations
+Electronical archives of BUFR since 1970s may be loaded
Work for many years!
Geneva, March 11, 2013
QUESTIONS AND COMMENTS ?
Thank you for your attention !