Spectrum Data Model: version 1.2

Goals

This update is to satisfy requested enhancements to the v1.1 model document.

Presentations by Vandana Desai

• Nov. 2020 Interop: Implementation of the IVOA Spectral Data Model at IPAC” assessment of V1.1 Recommendation
• May 2021 Interop: "IVOA Spectral Models and Access in the Era of Big Data” enhancement request to support IPAC use cases

Participants

data modeler: MarkCresitelloDittmar

editor(s): MarkCresitelloDittmar

implementer(s):

• Firefly: ???
  • Spectral plotter
• CASSIS: ???
  • Spectral analyser
• GAVO: ???
  • data provider

Use Cases

The requests stem from visualization use cases:

Discussion Threads

Preliminary meetings:

• Interop DAL/DM Session - May 27, 2021
• DAL/DM Running meeting - June 30, 2021
• IVOA - Spectrum Data Model change request - Oct. 15, 2021

Planning meetings:

• DM Meeting 20220622: Notes

• UCDs assigment for new elements - Jul 21, 2022
• UTypes in VOTable examples - Aug 18, 2022
• Invalid UCDs in standard - Mar. 20, 2023

Data Model Updates

The document is being updated in the IVOA Git repository

SpectrumDM: branch wd-v1.2: (https://github.com/ivoa-std/SpectrumDM/tree/wd-v1.2)

• Migration to Git - preparatory work
  • port Spectrum 1.1 REC document files to model repository
    • tag release (REC-V1.1-20111020)
  • create branch for RFE
  • restructure repository content to match other models
  • migrate model diagrams to proper UML
    • improve consistency with schema and description
• List of Changes:
  • 2022 Jun 22: Document reset to WD for enhancement
  • 2022 Jul 19: Add spectral order elements
  • 2022 Jul 20: Add upper/lower limit elements
  • 2023 Mar 17: Correct case for order and relorder attributes to match spec.
  • 2023 Apr 27: Correct UTypes in VOTable example 1; assign UCDs for upper/lower limits
• Open Issues:
  • #5: UCD assignment (resolved?)
    • selection of UCDs for the new elements had no clear resolution within the working group
    • last question of the discussion thread really sums it up
      • "are we talking about the upper/lower limits of the instrument or the source? Both are related, but the interpretation is different"
    • based on this discussion I have (tentatively) employed the following definitions
      • lower limit: "The minimum flux of the source due to instrument saturation" ==> instr.saturation;phot.flux.density;stat.min"
      • upper limit: "The maximum flux of the source to remain undetected due to instrument sensitivity" ==> instr.sensitivity;phot.flux.density;stat.max"
  • #7: Invalid UCD in standard
    • Review and discussion of DaCHs serializations identified several UCDs in the current REC which are invalid.
    • Discussion for Issue #5 identified some other actions which could be taken to improve the existing UCDs
      • Update UCD Vocabulary Reference is Section 3.4
      • Add tags which enable validation of UCDs contained in teh document (during build)
      • There is a UCD RFE documented on this wiki page; it is partially resolved in V1.1 and should be closed out.

Implementations

TBD

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