SDM evolution roadmap: Data.FluxAxis.Accuracy.LowerLimit another UCD suggestion

[Salgado, Jesus]

Dear all,

I fully agree that Upper/Lower Limits are not errors so, I think, it should not be treated as such from the ontology point of view.
I think we could use both ideas and separate the concepts of Upper and Lower Limits.

For me, intuitively:
Upper Limit is -> instr.saturation;phot.flux
Lower Limit is -> instr.sensitivity;phot.flux

(just removing the stat qualifiers)

Cheers,
Jesús Salgado 
SKA Regional Centre Architect
jesus.salgado at skao.int
www.skao.int <https://www.skao.int/>
SKA Observatory
Jodrell Bank, Lower Withington,
Macclesfield, SK11 9FT, UK
 

On 28/07/2022, 07:41, "dm on behalf of Laurent Michel" <dm-bounces at ivoa.net on behalf of laurent.michel at astro.unistra.fr> wrote:

    Hello

    AS questioned by Mark Upper/Lower limits are not Error terms. There are detection thresholds.

    UpperLimit: If it was a source here it would have a flux below the upper limit
    - instr.sensitivity;phot.flux;stat.max ??

    Lower limit: If it was a source here it would have a flux above the lower limit
    - instr.sensitivity;phot.flux;stat.min ??

    Laurent


    Le 27/07/2022 à 17:10, CresitelloDittmar, Mark a écrit :
    > Thanks Mireille,
    > 
    > These are very similar to the current placeholders ( which mimic the StatErrorLow|High element ucds )
    > The main question I have about this was/is:
    >    o is LowerLimit/UpperLimit conceptually considered an Error term?
    > If not, then perhaps the detection limit options are more appropriate.
    > 
    > Mark
    > 
    > 
    > 
    > On Tue, Jul 26, 2022 at 11:40 AM Mireille LOUYS <mireille.louys at unistra.fr <mailto:mireille.louys at unistra.fr>> wrote:
    > 
    >     Dear dmers,
    > 
    >     just on the UCD assignation , I have another suggestion for /Data.FluxAxis.Accuracy.LowerLimit /
    >     which also validates in the UCD builder tool (http://cdsweb.u-strasbg.fr/UCD/cgi-bin/descr2ucd
    >     <http://cdsweb.u-strasbg.fr/UCD/cgi-bin/descr2ucd> ) and contains the flux information:
    >     stat.error;phot.flux;stat.min
    > 
    >     /Data.FluxAxis.Accuracy.UpperLimit/ whould also have this UCD
    >     stat.error;phot.flux;stat.max
    > 
    >     Thanks , Mireille,
    >     for the UCD maintenance committee.
    > 
    > 
    >     Le 21/07/2022 à 20:22, CresitelloDittmar, Mark a écrit :
    >>     Hi,
    >>
    >>     Follow-up on the UCD topic.  I've started a new Issue in the repository
    >>     <https://github.com/ivoa-std/SpectrumDM/issues/5> for this, so it can be worked outside of the structural model changes.
    >>     The primary objective is to select the proper terms for the new elements.. I'm not sure if we need to go outside this list
    >>     for that, but I'm hoping Vandana and Petr can get some review on this and provide feedback.
    >>
    >>     The following shows the UCDs put into this PR, and the suggested values per the UCD Builder utility.
    >>
    >>       * Data.SpectralAxis.order => "instr.order"
    >>       * Data.SpectralAxis.relorder => "instr.order"
    >>           o UCD builder suggests: "stat.variance;instr.order" for both, though "instr.order" can stand on its own.
    >>       * Data.FluxAxis.Accuracy.LowerLimit => "stat.error.phot.flux.density;em.*;stat.min" (Same as StatErrorLow)
    >>           o UCD builder suggests:
    >>               + "statistical lower limit" -> "stat.value;stat.min"
    >>               + "detection lower limit" -> "instr.saturation;stat.min"
    >>       * Data.FluxAxis.Accuracy.UpperLimit => "stat.error.phot.flux.density;em.*;stat.max" (Same as StatErrorHigh)
    >>           o UCD builder suggests:
    >>               + "statistical upper limit" -> "stat.value;stat.max"
    >>               + "detection upper limit" -> "instr.saturation;stat.max"
    >>
    >>
    >>     Mark
    > 
    >     -- 
    >     --
    >     Mireille Louys,  MCF (Associate Professor)
    >     Centre de données CDS		IPSEO, Images, Laboratoire Icube
    >     Observatoire de Strasbourg	Telecom Physique Strasbourg
    >     11 rue de l'Université		300, Bd Sebastien Brandt CS 10413
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    >     Tel: +33 3 68 85 24 34
    > 

    --
    English version: https: //www.deepl.com/translator
    -- 
    jesuischarlie/Tunis/Paris/Bruxelles/Berlin

    Laurent Michel
    SSC XMM-Newton
    Tél : +33 (0)3 68 85 24 37
    Fax : +33 (0)3 )3 68 85 24 32
    Université de Strasbourg <http://www.unistra.fr>
    Observatoire Astronomique
    11 Rue de l'Université
    F - 67200 Strasbourg

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