applying a metadata standard for international weather information
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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) - PowerPoint PPT PresentationTRANSCRIPT
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Applying a metadata standard for
international weather information
Dr Steve Foreman, WMO and Met Office. 8 June 2005
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Introduction
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Contents
What is WMO?Why a metadata standard for WMO?IssuesWMO CoreConcepts and extensions
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WMO is….
UN Agency (1950)derived from IMO (1873)
Co-ordinate meteorologyweather
observations forecasts
climate changehydrologydisaster mitigation
187 Members
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WMO - Weather Forecasting
Rapid exchangeObservationsForecasts
Exchange formatsBrevity importantUnambiguous
language-independentcharacterbinary
“Obscure”
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WMO - climate
ObservationsModel simulations Interdisciplinary
meteorologyoceanographybiology
land marine
hydrologychemistry………..
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Why metadata?
Expanding science data not known data not exploited observations repeated
Exploitation decision systems non-experts
Need to: discover exchange
SMFW01 NWBB 270000AAXX 2700491753 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
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Issues for meteorology
MD_TopicCategoryCodeClimatology/Meteorology/Atmosphere
The whole of our discipline!
Subdivision would help
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Issues - time
ForecastsObservation time (span)Time forecast runValidity time of forecastAccumulation interval for, eg, rainfalletc
Climateuse 360 day year
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Issues - space
Irregular grids Different co-ordinatesECMWF store:
Spherical Harmonics (SH)
Gaussian Grid (GG) Latitude/Longitude (LL)
German weather model(http://www.dwd.de)
Coastal ocean model
http://oceanworld.tamu.edu/resources/ocng_textbook/chapter15/Images/Fig15-3.htm
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L R
Issues - space
Physical co-ordinatesOne parameter (eg “potential vorticity”) on a
constant value of another (eg “potential temperature”).
L
R
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Issues - continua
Feature or coverage – or both?Coverage obvious candidate, but
3 dimensional fields restrictive definition
Prefer Feature Catalogue flexible gridsone variable using other as co-ordinate
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Issues - implementation
Travelling metadatamany messages containing small packets of datanot practicable to send metadata with each oneprobably need to link to unchanging elements
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WMO Core
Subset of ISO 19115with extensions and interpretations
Testingclimate observations
http://cliware.meteo.ru/wdccatalog/index_en.htmlArctic studies
http://acsys.npolar.no/adis/adis.php#Datasetsautomated extraction from routine weather data
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Possible extensions
Community sub-topicsDefinitions of timeDefinitions of spaceReplace “coverage” with “features”