(r3) Utypes < IVOA

IVOA Web>IvoaDataModel>Utypes (revision 3) (raw view)~~EditAttach~~

<H1> DM work package : Utypes definition and syntax </H1>
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   *This topic is under the Data model pages but also addressed in the TCG Topic page :
http://www.ivoa.net/cgi-bin/twiki/bin/view/IVOA/TCGTopicsUtypes 

---+++ What are Utypes for
  Utypes are strings that we define in the VO to be able to represent and identify which role plays a specific piece of metadata %BR%
Ex: =astrometry statistical error = 0.02 arcsec= can be represented in the VO by :
==char:Spatial.Accuracy.StatError.Refval==
%BR% and verified by the XML schema derived from the Characterisation Data Model . 

---+++ How can I find which Utype is relevant for my data collection
   1 Select an IVOA data model to which you want to be compliant .     _Ex : Characterisation Data Model_    
   1 Browse the Utype list and its documentation to select the appropriate Utype for your metadata description  
   _Ex : for a Fits image : FITS keyword RESOL to map Spatial.Resolution.RefVal  Characterisation Data Model _    
            for a Fits simple spectrum : FITS keyword SPECRES to map Spectral.Resolution.RefVal  
   1 Check wether all mandatory Utypes are filled in . 

If you publish your data with Characterisation , you can use the CAMEA VO Tool (http://eurovotech.org/twiki/bin/view/VOTech/CharacEditorTool) to check the Utype assignation, and see how much your description is Characterisation DM compliant.










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Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
html	note-utype-draft1.5.html	r1	manage	34.1 K	2007-01-28 - 13:51	NormanGray	Draft Note on UTypes

Topic revision: r3 - 2008-06-11 - MireilleLouys

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