[Heig] HEIG Note discussion: Obscore and dataproduct_type and various classes of datasets in High energy data

[Dr. Ian N. Evans]

Hi Mireille et al.,

I'm on vacation until September 15 and mostly don't have internet access.  However I don't think that your figures are a good representation of the (what you have segregated into 3 different "types" of) datasets or the relationships between those datasets.  These datasets (particularly what you have identified as "explanatory" datasets) can have much broader scope and the relationships can be broader than the figures suggest.

When I return from vacation I'll provide a more detailed response.

Thanks,
--Ian
—

Dr. Ian Evans
Astrophysicist
Chandra X-ray Center
Center for Astrophysics | Harvard & Smithsonian

Office: (617) 496 7846 | Cell: (617) 699 5152
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> On Sep 3, 2025, at 10:30, Mireille Louys via heig <heig at ivoa.net> wrote:
> Dear VO Heig , ( cross post to DM as well)
> 
> During the VOHE note review , I came up on a question how to identify the various kinds of data sets we are talking about in the note,
> and how to consider their relationships .
> 
> I think we need uses cases to illustrate how a user will select a data set of interest from the various properties exposed:
> - in an observation data set,
> - in a response function data set ,
> -in other files as draws, pdf, regions proposed with respect to the Chandra archive that I have named 'explanatory datasets'
> 
> ObsDataset defined in Obscore is the result of an observation process, using the observing configuration.
> Response  are computed from various Obsconfig parameters.
> Explanatory datasets are also computed from statistical analysis on the observed data.
> 
> I suggest these are diffrent in nature and cannot derive from the Obsdataset class of Obscore .
> But they are tightly linked to it .
> 
> I have tried to illustrate the relations I can guess from our discussions , but this must be iterated with you, High Energy astronomers ,
> and with TAP designers to converge to a clear use case .
> 
> here attached is a first take  .
> 
> Thanks for your comments and suggestions .
> 
> Best , Mireille
> 
> --
> --
> Mireille Louys, MCF (Assistant Professor)
> Centre de données Astronomiques (CDS)       Equipe Images, ICube
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> <Datasets_roles_inVOHE.pdf>
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