DM work package : Characterisation Data Model

!!!Still!!! Work in progress : Site under re construction

• coordination : François Bonnarel

---

Goal

This workpackage is aiming at defining the high level metadata necessary to describe the astronomical data sets on their physical axes, either observed or simulated, for various types of data like 2D-images, data cubes, X-ray event lists, IFU data, etc.. The goal is to provide an abstraction which contains structured information for all these types of data so that discovery and interpretation is feasible in a general framework, and can be used jointly for science cases. The model aims at facilitating the manipulation of heterogeneous data in VO portals. A VO Characterization instance can include descriptions of the data axes, the range of coordinates covered by the data, and information on the data sampling and resolution on each axis. These descriptions are in terms of physical variables, with the specific instrumental signature abstracted away.

Charter

History

• started after Cambridge Interop 2003
• technical meetings in Garching, Strasbourg, Villa Franca
• First draft by 2005
• IVOA submission by spring 2007
• RFC for 3 documents :
  • The Model description: http://www.ivoa.net/Documents/latest/CharacterisationDM.html
  • Utype list : http://www.ivoa.net/Documents/latest/UtypeListCharacterisationDM.html
  • Implementations: http://www.ivoa.net/Documents/latest/ImplementationCharacterisation.html

The comments given during the discussion period are available at the RFC page :
http://www.ivoa.net/twiki/bin/view/IVOA/CharacterisationDataModelRFC

Results and Feedback

Data Model serialisation

Xml schema

• Characterisation XML schema version 1.11 Characterisation-v1.11.xsd

XML instance documents following the schema

• Xml documents for Characterisation draft version 1.0 http://alinda.u-strasbg.fr/Model/Characterisation/examples/

Implementations

• Aspid-SR
• Aladin
• Camea

Working Documents

• Characterisation data model current draft v1.0 (.pdf)

• Mireille Louys has produced a new version of the update of CharacterisationIvoadraft-v1.1.pdf, following on from discussion at the Astrospectroscopy and the VO meeting in Madrid (march 2007).

• Alberto Micol has produced a tutorial in order to help users to publish their data to the VO using Utypes from the Characterisation Model Characterisation Tutorial for publishing 2D images to the VO .
• 2005 Characterisation_Note_20051129.pdf: Characterization DM draft Note
• CharacterisationDraft-06May15.pdf: Characterisation Working Draft

• CharMandates.pdf: Mandatory keywords while using Characterisation DM

• update of CharacterisationIvoadraft-v1.1.pdf: Characterisation Model Working draft version 1.1

• ivoa_char_2d_image_tutorial_1.0.pdf: User's guide for Characterisation DM by Alberto Micol

• CharacterisationWDversion1.0.pdf: Characterisation Data Model
• CharacterisationImplementationv1.1.pdf: Implementations of the Characterisation DM v1.1

More documentation

• NotesOnPolarization

Interactions with other efforts

• IVOA Data Access Layer Access Protocols : SSA , SIA2, etc..
  
• Space Time Coordinates STC Coordinates representation
• Simulation Data Model

---