International Virtual Observatory Alliance

Difference: Utypes (4 vs. 5)

Revision 52009-05-25 - MireilleLouys

META TOPICPARENT	name="IvoaDataModel"

DM work package : Utypes definition and syntax

Site under re construction

*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 strings that we define in the VO to be able to represent and identify which role plays a specific piece of metadata
Ex: astrometry statistical error = 0.02 arcsec can be represented in the VO by :

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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.

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> Ex: astrometry statistical error = 0.02 arcsec This metadata can be represented in the VO by :

char:Spatial.Accuracy.StatError.Refval
and verified by the XML schema derived from the Characterisation Data Model .

How can I find which Utype is relevant for my data collection

Select an IVOA data model to which you want to be compliant. Ex : Characterisation Data Model
Browse the Utype list and its documentation to select the appropriate Utype list for your metadata description
Check wether all mandatory Utypes are filled in .

Examples: - For a Fits image : FITS keyword RESOL to map Spatial.Resolution.RefVal in the Characterisation Data Model utypes list

- For a Fits simple spectrum : FITS keyword SPECTRES to map Spectral.Resolution.RefVal

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< 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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> 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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WD-Utypes-0.3-20090522.pdf: Utype preliminary WD

META FILEATTACHMENT	attr="" comment="Draft Note on UTypes" date="1169992282" moveby="MireilleLouys" movedto="IVOA.Utypes" movedwhen="1213181130" movefrom="IVOA.IvoaDataModel" name="note-utype-draft1.5.html" path="note-utype-draft1.5.html" size="34896" user="NormanGray" version="1.1"

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META FILEATTACHMENT	attr="" comment="Utype preliminary WD" date="1243283468" name="WD-Utypes-0.3-20090522.pdf" path="WD-Utypes-0.3-20090522.pdf" size="560156" user="MireilleLouys" version="1.1"

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