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WMO Core Metadata

WMO Core Metadata. Dr Steve Foreman Chair, Inter-Programme Expert Team on Metadata Implementation. Contents. Data challenges facing meteorology What is “metadata”? WMO approach to metadata Implementation of the standards. Regional Associations. R.A. VI Europe (49 Members). R.A. IV

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WMO Core Metadata

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  1. WMO Core Metadata Dr Steve Foreman Chair, Inter-Programme Expert Team on Metadata Implementation

  2. Contents • Data challenges facing meteorology • What is “metadata”? • WMO approach to metadata • Implementation of the standards

  3. Regional Associations R.A. VI Europe (49 Members) R.A. IV North America, Central America And the Caribbean (25 Members) R.A. II Asia (35 Members) R.A. I Africa (56 Members) R.A. V South-West Pacific (22 Members) R.A.III South America (13 Members) Challenges facing WMO

  4. Technical Commissions • Basic Commissions • Commission for Basic Systems (CBS) • Commission for Instruments and Methods of Observations (CIMO) • Commission for Hydrology (CHy) • Commission for Atmospheric Sciences (CAS) • Applications Commissions • Commission for Aeronautical Meteorology (CAeM) • Commission for Agricultural Meteorology (CAgM) • JointWMO/IOC technicalCommission for Oceanography and Marine Meteorology (JCOMM) • Commission for Climatology (CCl) Challenges for WMO

  5. Challenges for WMO Weather forecast 23 400 000 Surface temperature 3 050 000 Climate change 67 600 000 Hurricane warning 375 000

  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 • the conditions at an observing site • although • these can be described by metadata

  8. Data Metadata What is metadata? Observing site name: Aviemore Location (deg lat, deg long): 57N, 3W Elevation: 226m Parameter observed: temperature Operator: Met Office Started:11:50 01/01/01 Ended:12:00 01/01/01 Value: 4 Units: Celsius Instrument instrument number: 123456 instrument inspection date: 01/01/01 instrument type: Magic mercury 1234

  9. What is metadata? • Need to agree • what needs to be described • how they will be organised • what they will be called • So that • non-specialists can find data • applications can handle data

  10. WMO approach to metadata • Build on existing standards • WMO • GRIB and BUFR definitions • ISO • 191xx series • Geographic metadata (19115)  • XML representation (19139) ? • Open Geospatial Consortium • Catalog service ?

  11. WMO Core metadata • Use ISO 19115 • international standard • evolving • lessons from other users • Complex • select subset • expand where essential • but can cause problems for others

  12. WMO Core Metadata • Core metadata: • subset of full standard • most appropriate elements for field • some extensions to cover specific needs • Contents of Core: • Mandatory: required either by ISO standard or by Core • Optional: elements expected to be included, but not always applicable

  13. WMO Core metadata - overview

  14. WMO Core metadataWMO specifics • Topic ISO standard: climatology, meteorology, atmosphere, environment, oceans add: list of more specific topics • Keywords add: define list of standard physical quantities

  15. WMO Core MetadataWMO specifics • Space add: Irregular point set • Time add: 360 day calendar

  16. WMO Core metadataStatus • Draft standard • presented to CBS XIII • available for testing • does it cover needs of Programmes? • are all the extensions needed? • is it too biased to World Weather Watch?

  17. WMO Core metadataStatus • XML • practical method of exchanging information • schemas written and tested • but now ISO standard agreed

  18. WMO Core metadataStatus Temperature in Sweden? Discover Stockholm, please Select Retrieve

  19. WMO Core MetadataStatus • Features • describe actual data 211620Z EGLL EGLL 211620Z 19007KT 170V230 9999 FEW038 BKN060 20/11 Q1020 NOSIG

  20. WMO Core metadataStatus • Tests: • Russian climatology • SIMDAT data supply • ACSYS polar information

  21. Implementation • Technical • define features • review standard • ISO changes • extensions needed? • what in “metadata”, what in “features”? • apply new standards • XML representation • Open Geospatial Consortium catalogues

  22. Implementation • Testing • needs of other Programmes • interoperability • Processes • maintenance • Core Profile • Catalogues • Lexicons • etc….

  23. Summary • Metadata • increase usefulness of data • WMO Core • description available to all • Implementation • test for non-World Weather Watch • XmL representation • feature definition • tools

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