[fitsbits] Stokes axis convention

[Arnold Rots]

The draft design of STC2 for IVOA defines the polarization axis as an
enumerated coordinate axis with options Stokes, circular, linear, and
vector. The  coordinates are enumerated as strings.

  - Arnold
On Dec 19, 2014 4:42 PM, "Douglas Tody" <dtody at nrao.edu> wrote:

> The VO standards are based upon the FITS convention (e.g., polarization
> types, IQUV, LL, RR, etc.), except that the integer coding is not used.
> The names of the polarization states as defined in FITS WCS are used
> instead, hence the scheme is easily extended, although usage so far
> merely mirrors FITS.  - Doug
>
>
> On Fri, 19 Dec 2014, William Thompson wrote:
>
>  The original WCS paper included a way of expressing Stokes parameters as
>> one of the dimensions of a data cube, and this has since been incorporated
>> into version 3.0 of the FITS standard.  I was wondering to what extent this
>> capability has been taken up by the community.  Is it widely used?
>>
>> I ask because I was looking at a rough draft of a document describing
>> data formatting for a solar virtual observatory being put together in
>> Europe, and one part of the document called for putting each Stokes
>> parameter in a separate HDU.  Based on the current FITS document, that
>> would seem contrary to common and accepted practice in the broader
>> astronomical community, and I would like to confirm that.
>>
>> Bill Thompson
>>
>> --
>> William Thompson
>> NASA Goddard Space Flight Center
>> Code 671
>> Greenbelt, MD  20771
>> USA
>>
>> 301-286-2040
>> William.T.Thompson at nasa.gov
>>
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>>
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