SSA v1.1 Erratum 4: Make coverage optional

Author: James Dempsey

Date last changed: 2023-12-04

Date accepted:

Github Issue: SSA Issue #8


SSA 1.1 sec states MANdatory coverage information (Char.SpatialAxis.Coverage.Location.Value + 2 others), but they are missing from the example in Appendix A. Theoretical services cannot provide coverage information so these columns should be made optional to support theoretical services.

Erratum Content

In section, add the following text at the end of the introductory sentence.

Where coverage information is available, such as in observational services, the columns Char.SpatialAxis.Coverage.Location.Value, Char.SpatialAxis.Coverage.Bounds.Extent, Char.TimeAxis.Coverage.Location.Value, Char.SpectralAxis.Coverage.Location.Value, and Char.SpectralAxis.Coverage.Bounds.Extent should be provided.  However, this component is optional to support theoretical services and other services which do not have coverage information.

and in the table in that section change the value in the Req column from MAN to REC for the following rows:

UTYPE Description Req Default
Char.SpatialAxis.Coverage.Location.Value Observed position, e.g., RA DEC REC  
Char.SpatialAxis.Coverage.Bounds.Extent Aperture angular diameter, deg REC  
Char.TimeAxis.Coverage.Location.Value Midpoint of exposure (MJD) REC  
Char.SpectralAxis.Coverage.Location.Value Midpoint of Spectral coord range REC  
Char.SpectralAxis.Coverage.Bounds.Extent Width of spectrum in meters REC  

Impact Assessment

By loosening the requirements for positional description of the spectra, existing theory services will be able to be compliant. Clients will need to allow for the coverage fields to be missing. However, they already need to do that for established SSA theory services, of which there are at least five at this point; RegTAP query:

select count(ivoid)
from rr.res_detail
where detail_xpath='/capability/dataSource'
and detail_value like 'theor%'

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Topic revision: r3 - 2024-05-19 - JamesDempsey
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