Multi-dimensional Data Access minimal requirements

[Patrick Dowler]

 From the discovery use cases summarised below, the current WD-SIA-2.0 
has parameters to support most of the axis fields (with the applicable 
ObsCore column in brackets):

    RA,Dec               -> POS  (s_region)
    Frequency/wavelength -> BAND (em_min, em_max)
    Polarization states  -> POL  (pol_states)
    Time of observation  -> TIME (t_min, t_max)

We will need 3 additional parameters to query these:

    Spatial size         -> ? (s_fov)
    Angular resolution   -> ? (s_resolution)
    Integration time     -> ? (t_exptime)

My inclination is to define parameters with a prefix taken from the 
axis, such as POS_???, BAND_???, TIME_??? etc. There are also existing 
usages (eg. SPATRES in SSA) that mean the same thing; I'm not sure if 
trying to use existing parameter names will make it easier or get us 
into a bind later on...

Action Item for WG: propose 1-3 parameter names to query the above 3 
numeric fields of ObsCore; think about how more parameters might be 
defined for querying other ObsCore fields (including ObsCore-1.x if 
something gets added).

thanks


On 06/03/14 04:14 PM, Gaudet, Severin wrote:
> Multi-dimensional Data Access minimal requirements:
>
>   * Data Discovery (Query)
>       o A service shall be able to receive queries regarding its data
>         collection(s) from a client, with the client placing one or more
>         of the following constraints:
>           + RA,Dec
>           + Frequency/wavelength
>           + Polarization states
>           + Spatial size
>           + Angular resolution
>           + Integration time
>           + Time of observation

-- 

Patrick Dowler
Canadian Astronomy Data Centre
National Research Council Canada
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