International Virtual Observatory Alliance

Difference: Utypes (3 vs. 4)

Revision 42009-05-24 - MireilleLouys

  META TOPICPARENT 
  name="IvoaDataModel"  

 DM work package : Utypes definition and syntax 




Site under re construction
- META TOPICPARENT
+  name="IvoaDataModel"
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+	*This topic is under the Data model pages but also addressed in the TCG Topic page :
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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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+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 
 
Ex: astrometry statistical error = 0.02 arcsec 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
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+ 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 for your metadata description  	_Ex : for a Fits image : FITS keyword RESOL to map RefVal  Characterisation Data Model _
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+ 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
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+				for a Fits simple spectrum : FITS keyword SPECRES to map RefVal
  Check wether all mandatory Utypes are filled in .
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+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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+ Examples
 	- For a Fits image :  FITS keyword RESOL to map Spatial.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  

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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 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"
- 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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