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ivoa-std / CoordinateDM

Astronomical Coordinates and Coordinate Systems Data Model
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Polarization description not flexible enough #17

Open pahjbo opened 3 weeks ago

pahjbo commented 3 weeks ago

see https://listmgr.nrao.edu/pipermail/fitswcs/2008-March/thread.html

lmichel commented 3 weeks ago

During the model PR period, I looked in Vizier for data with polarisation parameters that match the model and I didn't find any. My understanding at that time was that the way polarisation is expressed is very flexible, making difficult to have a model working for any case.

mcdittmar commented 3 weeks ago

Thanks for that reference! Is there a use-case you are working that would require expansion of the Polarization model?

I'll preface this comment with the statement that I have not read the full thread..

What is in the model now is primarily in support of the what is described in the FITS WCS standard. Transforming a numeric value to polarization state. During the model development I had brought up the topic of fractional polarization, but it didn't make the cut.