DM work package : Utypes definition and syntax+++ Last draft on Utype definition : WD-Utypes-0.4-20091107.pdf | ||||||||
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< < | +++ Last proposal (presentation) at Interop May 2010 in Victoria UtypesIntheIVOA.pdf | |||||||
> > | +++ Last iterations on the definitions (presentations @ interop meetings) | |||||||
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This topic is under the Data model pages but also addressed in the TCG Topic page : ?? TCGTopicsUtypes
What are Utypes for | ||||||||
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< < | Utypes are names that we can attach to a piece of metadata in order to point to the same concept expessed in a VO data model. | |||||||
> > | Utypes are names that we can attach to a piece of metadata in order to point to the same concept expressed in a VO data model. | |||||||
Ex: astrometry statistical error = 0.02 arcsec | ||||||||
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< < | This metadata can be represented in the VO by : | |||||||
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> > | This metadata can be represented in the VO using the Characterisation data model by : | |||||||
char:Spatial.Accuracy.StatError.Refval | ||||||||
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< < | and verified by the XML schema derived from the Characterisation Data Model . | |||||||
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> > | If we associate "astrometry statistical error" with this utype, we can derive various properties like:
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How can I find which Utype is relevant for my data collection
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< < | - For a Fits image : FITS keyword RESOL to map Spatial.Resolution.RefVal in the Characterisation Data Model utypes list | |||||||
> > | - For a Fits image : FITS keyword RESOL will map SpatialAxis.Resolution.RefVal in the Characterisation Data Model utypes list | |||||||
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< < | - For a Fits simple spectrum : FITS keyword SPECTRES to map Spectral.Resolution.RefVal | |||||||
> > | - For a Fits simple spectrum : FITS keyword SPECTRES will map SpectralAxis.Resolution.RefVal | |||||||
If you publish your data with CharacterisationDM-v1.11 , you can use the CAMEA VO Tool (http://eurovotech.org/twiki/bin/view/VOTech/CharacEditorTool) to check the Utype assignation, and verify if your description is compliant to this model.
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