Utypes < IVOA

<H1> DM work package : Utypes definition and syntax </H1>
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   +++ Last draft on Utype definition : 
[[%ATTACHURL%/WD-Utypes-0.4-20091107.pdf][WD-Utypes-0.4-20091107.pdf]]
   +++ Last proposal (presentation) at Interop May 2010 in Victoria
[[http://www.ivoa.net/internal/IVOA/InterOpMay2010DMDALUtypesIntheIVOA.pdf][UtypesIntheIVOA.pdf]]


   This topic is under the Data model pages but also addressed in the TCG Topic page : ?? IVOA.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.
%BR%
Ex: =astrometry statistical error = 0.02 arcsec= 
This metadata 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 list for your metadata description 
   1 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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   * [[%ATTACHURL%/WD-Utypes-0.3-20090522.pdf][WD-Utypes-0.3-20090522.pdf]]: Utype preliminary WD

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	WD-Utypes-0.3-20090522.pdf	r1	manage	547.0 K	2009-05-25 - 20:31	MireilleLouys	Utype preliminary WD
pdf	WD-Utypes-0.4-20091107.pdf	r1	manage	580.4 K	2009-11-09 - 09:04	MireilleLouys
html	note-utype-draft1.5.html	r1	manage	34.1 K	2007-01-28 - 13:51	NormanGray	Draft Note on UTypes

This topic: IVOA > WebHome > IvoaDataModel > Utypes
Topic revision: r7 - 2010-12-08 - MireilleLouys