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Applying a metadata standard for international weather information

Applying a metadata standard for international weather information. Dr Steve Foreman, WMO and Met Office. 8 June 2005. Introduction. Contents. What is WMO? Why a metadata standard for WMO? Issues WMO Core Concepts and extensions. WMO is…. UN Agency (1950) derived from IMO (1873)

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Applying a metadata standard for international weather information

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  1. Applying a metadata standard for international weather information Dr Steve Foreman, WMO and Met Office. 8 June 2005

  2. Introduction

  3. Contents • What is WMO? • Why a metadata standard for WMO? • Issues • WMO Core • Concepts and extensions

  4. WMO is…. • UN Agency (1950) • derived from IMO (1873) • Co-ordinate meteorology • weather • observations • forecasts • climate change • hydrology • disaster mitigation • 187 Members

  5. WMO - Weather Forecasting • Rapid exchange • Observations • Forecasts • Exchange formats • Brevity important • Unambiguous • language-independent • character • binary • “Obscure”

  6. WMO - climate • Observations • Model simulations • Interdisciplinary • meteorology • oceanography • biology • land • marine • hydrology • chemistry • ………..

  7. Why metadata? • Expanding science • data not known • data not exploited • observations repeated • Exploitation • decision systems • non-experts • Need to: • discover • exchange SMFW01 NWBB 270000 AAXX 27004 91753 32481 51008 10331 20259 40078 58017 83202 333 20263 59018 83816 84078= 91754 01581 51812 10287 20245 40092 58017 60034 70182 85200 333 20256 59016 60017 85820= NNNN

  8. Issues for meteorology • MD_TopicCategoryCode • Climatology/Meteorology/Atmosphere • The whole of our discipline! • Subdivision would help

  9. Issues - time • Forecasts • Observation time (span) • Time forecast run • Validity time of forecast • Accumulation interval for, eg, rainfall • etc • Climate • use 360 day year

  10. Irregular grids Different co-ordinates ECMWF store: Spherical Harmonics (SH) Gaussian Grid (GG) Latitude/Longitude (LL) Coastal ocean model Issues - space http://oceanworld.tamu.edu/resources/ocng_textbook/chapter15/Images/Fig15-3.htm German weather model (http://www.dwd.de)

  11. L R R L Issues - space • Physical co-ordinates • One parameter (eg “potential vorticity”) on a constant value of another (eg “potential temperature”).

  12. Issues - continua • Feature or coverage – or both? • Coverage obvious candidate, but • 3 dimensional fields • restrictive definition • Prefer Feature Catalogue • flexible grids • one variable using other as co-ordinate

  13. Issues - implementation • Travelling metadata • many messages containing small packets of data • not practicable to send metadata with each one • probably need to link to unchanging elements

  14. WMO Core • Subset of ISO 19115 • with extensions and interpretations • Testing • climate observations • http://cliware.meteo.ru/wdccatalog/index_en.html • Arctic studies • http://acsys.npolar.no/adis/adis.php#Datasets • automated extraction from routine weather data

  15. Possible extensions • Community sub-topics • Definitions of time • Definitions of space • Replace “coverage” with “features”

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