Transf WD Where are the axis

[Laurent MICHEL]

Sorry,

I flushed my browser cache, and the new draft showed up.
I'll look at it.

Laurent


Le 03/04/2020 à 14:51, David Berry a écrit :
> On Fri, 3 Apr 2020 at 13:14, Laurent MICHEL
> <laurent.michel at astro.unistra.fr> wrote:
>>
>> David,
>>
>> My feeling is, like Gerad said, that the mappings should be more
>> explicit in the model. I missed that point on March 10.
>>
>>
>> Le 02/04/2020 à 16:55, David Berry a écrit :
>>> I agree maybe we've been a bit too free and easy with the use of the
>>> word "axis" in the document. I many cases we should probably replace
>>> "axis" with "mapping input" or "mapping output".
>>
>> Would be better but likely not enough (IMO).
>>
>>   >
>> The definition of
>>> which physical quantities are associated with each input and output is
>>> provided by the TransformSet.
>> Do you mean TCompound?
> 
> No, I really do mean TransformSet.  Are you sure you're looking at the
> new draft?
> 
> https://volute.g-vo.org/svn/trunk/projects/dm/STC/Trans/doc/WD-Trans-1.0.pdf
> 
>> I'm may be confused with the scope of the model.
>> In FITS-WCS there is no explicit binding between e.g. image pixels and
>> WCS keywords.
>> WCS just says that this image has been generated by applying that
>> transformation. If the scope of TRANSF is to do the same in VOTables, it
>> is fine.
>>   From another hamd, if the ambition of Transf was to be able to model
>> workflows (sequence of transformations), we would have to be able to say
>> what kind of input data are expected by a given operation and to which
>> data are produced. If we assumed that all transformed things are
>> matrices, just specifying the input/output dimensions could do the job
>> does it?
> 
> That is  the purpose of the TransformSet - to define what physical
> quantities are expected as the inputs and outputs of the Mappings.
> 
> David
> 

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