String Measurement with STC2

[CresitelloDittmar, Mark]

Laurent,

To answer the primary question:
  Yes, the models do allow for 'discrete' data, and this is exercised with
the Polarization object.
  The values (coord) are PolCoordValue types from the coordinates model,
which are Enumerations (matching your second use case).

My expectation for Source model is that it will define other properties
which extend Measure in much
the same way as the current suite ( Position, Velocity, ProperMotion, Time,
Polarization ).  By extending
Measure, they will automatically be usable in Cube-s.

As for non-numeric data.. it really depends on what the string represents.
  e.g. "Q" =  Stokes Polarization.

In your examples, a MOC or STC-S string do not equate to Measure.
STC-S = a standardized serialization for specific sets of STC-1.33 objects.
o The string itself maps to a set of complex objects, not a single value
o  It spans more of STC-1.33 than is covered by the new component models
(Coords, Meas, Trans).
   So, while it should be possible to express a Measurement instance as an
STC-S string, not all STC-S
   strings can be resolved into NEW component model instances.  For
example, STC-S includes Regions
   and Intervals, as well as some properties not covered (Spectral) in the
current Measurement model.

So, when working the Source model, it'll be important to identify which
Properties can extend Measure
(or reuse components thereof), and what concepts are 'missing' (eg: Region).

Mark


On Mon, Aug 26, 2019 at 11:26 AM Laurent Michel <
laurent.michel at astro.unistra.fr> wrote:

> Hello DMers,
>
> I'm experimenting the use of STC2 (Meas/Cood) for a proposal for a generic
> model for source data.
>
> The idea is to use, as lond as possible,  STC2 measures for all quantities
> attached to one source.
>
> My question is to know whether it is possible to have a Measurement with
> non numerical values.
> I've 2 use cases:
> - Object shape: a MOC or a STC string, both being possibly serialized as
> strings
> - Object type: literal
>
> Can I use Generic classes (GenericMeasure and GenericCoord) or should I
> extend meas:Measure with my own stuff?
>
> Best
> Laurent
>
> --
> jesuischarlie/Tunis/Paris/Bruxelles/Berlin
>
> Laurent Michel
> SSC XMM-Newton
> Tél : +33 (0)3 68 85 24 37
> Fax : +33 (0)3 )3 68 85 24 32
> Université de Strasbourg <http://www.unistra.fr>
> Observatoire Astronomique
> 11 Rue de l'Université
> F - 67200 Strasbourg
>
>
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