International Virtual Observatory Alliance

Difference: Utypes (6 vs. 7)

Revision 72010-12-08 - MireilleLouys

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DM work package : Utypes definition and syntax

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< New draft on Utype definition and syntax

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> +++ Last draft on Utype definition :

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> WD-Utypes-0.4-20091107.pdf +++ Last proposal (presentation) at Interop May 2010 in Victoria UtypesIntheIVOA.pdf

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< *This topic is under the Data model pages but also addressed in the TCG Topic page : ?? TCGTopicsUtypes

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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

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.
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

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

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