[ImageDM] Mapping

[CresitelloDittmar, Mark]

Doug,

The Image and Spectral models have CoordSys outside of Characterisation,
and that object is described as basing from the STC astroCoordSys (?)
element.
So, I am not suggesting we replicate anything.. the STC recommendation
already supports the definition of relations (transforms) between
coordinate frames.
I am suggesting that we use that.

I'll do my best to get a diagram of what I have in mind out to the group
today.. the Observation/Dataset separation took up my time this weekend.

On Sun, Nov 24, 2013 at 6:07 PM, Douglas Tody <dtody at nrao.edu> wrote:

> On Sun, 24 Nov 2013, CresitelloDittmar, Mark wrote:
>
>  ... I reiterate that the Mapping
>>
>> information, which defines coordinate systems, should be contained within
>> the CoordSys umbrella, using existing VO standards as much as possible.
>>
>
> The existing WCS formalism (as captured in Mapping) does a lot more than
> just define the coordinate systems used in the Mapping.  The current WCS
> model is comparable in size to Characterization.  Are we suggesting
> trying to replicate all of this within the Characterization model (e.g.,
> the CD matrix, tabular coordinate value / index arrays, etc.).  Note
> also, that in defining a WCS we (or a Photometric calibration and the
> like) are no longer merely defining the characteristics of the dataset.
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