VEP-011: datalink/core#thumbnail

[Patrick Dowler]

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> 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> 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
> > Author: 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
> >
> > 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
> >
> > (or in VCS at
> > <http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-011.txt>)
> >
> > Opinions?  Endorsements?
> >
> > Thanks,
> >
> >           Markus
>
>
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