VEP-011: datalink/core#thumbnail

[Baptiste Cecconi]

Hi Ada, 

in my use cases, thumbnails are very low resolution versions of previews, so that it can be displayed very fast on web interfaces where many previews are shown altogether. 

Exemple of datalink with #thumbnail:
http://vogate.obs-nancay.fr/nda/q/dl/dlmeta?ID=ivo%3A//vopdc.obspm/~%3Fnda/S000612_cdf <http://vogate.obs-nancay.fr/nda/q/dl/dlmeta?ID=ivo%3A//vopdc.obspm/~%3Fnda/S000612_cdf>

and to make it more explicit:
- a preview: https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/S000612.png <https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/S000612.png> 
- a thumbnail: https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/T_S000612.png <https://realtime.obs-nancay.fr/dam/databf/web/soleil/ql//B-W/2000/06/T_S000612.png>

Baptiste

> Le 2 déc. 2021 à 13:57, ada nebot <ada.nebot at astro.unistra.fr> a écrit :
> 
> 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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