4 Technical Commissions Challenges for WMOTechnical CommissionsBasic CommissionsCommission for Basic Systems (CBS)Commission for Instruments and Methods of Observations (CIMO)Commission for Hydrology (CHy)Commission for Atmospheric Sciences (CAS)Applications CommissionsCommission for Aeronautical Meteorology (CAeM)Commission for Agricultural Meteorology (CAgM)Joint WMO/IOC technical Commission for Oceanography and Marine Meteorology (JCOMM)Commission for Climatology (CCl)
5 Challenges for WMO Weather forecast 23 400 000 Surface temperature Climate changeHurricane warning
6 What is metadata? “Data about data” describes data what are the data? where are they for?who is responsible?what are the units?………..
7 What is metadata? In this context it is not although the conditions at an observing sitealthoughthese can be described by metadata
8 What is metadata? Observing site name: Aviemore Location (deg lat, deg long): 57N, 3WElevation: 226mParameter observed: temperatureOperator: Met OfficeStarted: 11:50 01/01/01Ended: 12:00 01/01/01Value: 4Units: CelsiusInstrumentinstrument number:instrument inspection date: 01/01/01instrument type: Magic mercury 1234DataMetadata
9 What is metadata? Need to agree So that what needs to be described how they will be organisedwhat they will be calledSo thatnon-specialists can find dataapplications can handle data
10 WMO approach to metadata Build on existing standardsWMOGRIB and BUFR definitionsISO191xx seriesGeographic metadata (19115) XML representation (19139) ?Open Geospatial ConsortiumCatalog service ?
11 WMO Core metadata Use ISO 19115 Complex international standard evolvinglessons from other usersComplexselect subsetexpand where essentialbut can cause problems for others
12 WMO Core Metadata Core metadata: Contents of Core: subset of full standardmost appropriate elements for fieldsome extensions to cover specific needsContents of Core:Mandatory: required either by ISO standard or by CoreOptional: elements expected to be included, but not always applicable
13 WMO Core metadata - overview About metadataMetadata standardLanguageMaintenanceDataset detailsTitle of datasetDescription (abstract), topics coveredWhere data are, formatTime and spaceRepresentative:Area/volume covered by dataTime span for dataIPR issuesOwner and contactRestrictions on useData typesPhysical quantities, units, specific qualitiesQuality control and processing information
14 WMO Core metadata WMO specifics TopicISO standard: climatology, meteorology, atmosphere, environment, oceansadd: list of more specific topicsKeywordsadd: define list of standard physical quantities
15 WMO Core Metadata WMO specifics Spaceadd: Irregular point setTimeadd: 360 day calendar
16 WMO Core metadata Status Draft standardpresented to CBS XIIIavailable for testingdoes it cover needs of Programmes?are all the extensions needed?is it too biased to World Weather Watch?
17 WMO Core metadata Status XMLpractical method of exchanging informationschemas written and testedbut now ISO standard agreed
18 WMO Core metadata Status Temperature in Sweden?DiscoverStockholm,pleaseSelectRetrieve
19 WMO Core Metadata Status Featuresdescribe actual data211620Z EGLL EGLL Z 19007KT 170V FEW038 BKN060 20/11 Q1020 NOSIG
20 WMO Core metadata Status Tests:Russian climatologySIMDAT data supplyACSYS polar information
21 Implementation Technical define features review standard ISO changesextensions needed?what in “metadata”, what in “features”?apply new standardsXML representationOpen Geospatial Consortium catalogues
22 Implementation Testing Processes needs of other Programmes interoperabilityProcessesmaintenanceCore ProfileCataloguesLexiconsetc….
23 Summary Metadata WMO Core Implementation increase usefulness of data description available to allImplementationtest for non-World Weather WatchXmL representationfeature definitiontools