2004 Sepjcm/sao/nvo1 Spectrum Data Model Jonathan McDowell CfA US National Virtual Observatory.

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Presentation transcript:

2004 Sepjcm/sao/nvo1 Spectrum Data Model Jonathan McDowell CfA US National Virtual Observatory

2004 Sepjcm/sao/nvo1 Short term Spectral DM Spectral Energy Distribution (SED) Collection of 'segments' Each segment is a photometry point, a spectrum or a time series Defined metadata for bandpass, aperture, spectral coordinates Interim for SSAP pending full Observation model

2004 Sepjcm/sao/nvo1 SED Segments

2004 Sepjcm/sao/nvo1 Compromises Keep it simple: first cut, don't solve all problems Explicit listing of ( lambda, flux) or (lambda1, lambda2, flux) for each point No detailed space-time coords description Only supports 1-D extracted spectral data - no support for raw spectra on 2-D imagers etc. Do we need support for (count spectrum + sensitivity curve)? Not there right now

2004 Sepjcm/sao/nvo1 UML diagram

2004 Sepjcm/sao/nvo1 SED Issues For `science-grade' analysis need extra metadata Each segment has 'associated metadata' Each point has bandpass, systematic and statistical errors Time series and spectra closely related, allow both

2004 Sepjcm/sao/nvo1 Main changes since Boston Rearranged to make an explicit array of 'points' Added detailed VOTable and object- XML instances and XML schema Added UTYPEs in VOTable

2004 Sepjcm/sao/nvo1 VOTable approach - 1

2004 Sepjcm/sao/nvo1 VOTable approach - 2

2004 Sepjcm/sao/nvo1 XML instance example

2004 Sepjcm/sao/nvo1 XML instance example (2)

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