VEP-011: datalink/core#thumbnail

[ada nebot]

Hi All, 

Thanks for the clarifications. 
The term makes total sense to me too. I just wanted to clarify the preview versus thumbnail differences for the record. 

I fully support the term. 

Cheers,
Ada
--
Astronome Adjointe
CDS, Observatoire Astronomique de Strasbourg (ObAS)
UMR 7550 Université de Strasbourg 
11, rue de l'Université, F-67000 Strasbourg
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> On 2 Dec 2021, at 19:39, Patrick Dowler <pdowler.cadc at gmail.com> wrote:
> 
> 
> As the proposer of #thumbnail, we picked it because it seems to be a common term used to mean "fairly small preview", hence it is a child of preview (narrower). The general usage is that a client could feasibly load and/or display many thumbnails at once because they are small, so it is really a hint to a user interface.
> 
> Yes, data providers can chose the appropriate one and there is no specific "size" that makes a preview qualify as a thumbnail. At least for CADC, there is usually (~always) a #preview and a #thumbnail ("the better one or the smaller one" :-) but one doesn't need to have both to benefit clients. 
> 
> --
> Patrick Dowler
> Canadian Astronomy Data Centre
> Victoria, BC, Canada
> 
> 
> On Thu, 2 Dec 2021 at 05:05, ada nebot <ada.nebot at astro.unistra.fr <mailto:ada.nebot at astro.unistra.fr>> wrote:
> Hi Markus,
> 
> I wonder what the difference between preview and thumbnail is. In other words: when is one used against the other? when is a small preview considered a thumbnail? Also, does it make any real difference in the behaviour of a client? 
> 
> I call thumbnails to small things, but are previews of finding charts for instance thumbnails? For instance, do ZTF or LSST reference images (in whatever format) belong to this category? 
> 
> I see that preview is parent of thumbnail so I guess it is up to the data providers to use one or the other and for the client it doesn’t make much of a difference, right? 
> 
> Cheers,
> Ada
> 
> 
> > On 2 Dec 2021, at 11:49, Markus Demleitner <msdemlei at ari.uni-heidelberg.de <mailto:msdemlei at ari.uni-heidelberg.de>> wrote:
> > 
> > Dear Semantics WG, dear DAL,
> > 
> > We have another proposal for a new term in datalink/core:
> > 
> > Vocabulary: http://www.ivoa.net/rdf/datalink/core <http://www.ivoa.net/rdf/datalink/core>
> > Author: pdowler.cadc at gmail.com <mailto:pdowler.cadc at gmail.com>
> > Date: 2021-10-18
> > 
> > Term: thumbnail
> > Action: Addition
> > Label: Small Graphical Representation
> > Description: A very small preview suitable for displaying many at one time
> > Relationships: rdfs:subProperyOf(preview)
> > Used-in: https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/caom2ops/datalink?ID=ivo://cadc.nrc.ca/BLAST?BLASTabell31122006-12-21/REDUCED_250_2009-03-06 <https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/caom2ops/datalink?ID=ivo://cadc.nrc.ca/BLAST?BLASTabell31122006-12-21/REDUCED_250_2009-03-06>
> > 
> > Rationale: The term is used to specify that the link target is a small
> > preview suitable for displaying many such "thumbnails" at one time. The
> > primary use case is for a user interface to load or display these in a
> > table or as a popup, usually one per row but a grid of thumbnails might
> > be useful as well.
> > 
> > This is used in the CADC AdvancedSearch user interface as a popup when
> > users mouse over the preview links and allows the application to load
> > many of these at once. Example (BLAST + calibrated image query): 
> > 
> > https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/search/?Observation.collection=BLAST&Plane.calibrationLevel=2 <https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/search/?Observation.collection=BLAST&Plane.calibrationLevel=2>
> > 
> > (or in VCS at
> > <http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-011.txt <http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-011.txt>>)
> > 
> > Opinions?  Endorsements?
> > 
> > Thanks,
> > 
> >           Markus
> 

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