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[fitsbits] [Fwd: PV index perhaps wrong in version 3.0]



 
 
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Old September 10th 08, 06:34 PM posted to sci.astro.fits
Eric Greisen
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Posts: 8
Default [fitsbits] [Fwd: PV index perhaps wrong in version 3.0]

William Pence wrote:
The question below regarding WCS keyword usage was sent to the FITS
support office. Is Table 8.1 in the FITS Standand incorrect? (See
http://fits.gsfc.nasa.gov/fits_standard.html ).
Should it state that LONPOLEa and LATPOLEa
are associated with PVi_3a and PVi_4a instead of PVi_1a and PVi_2a?

Bill

-------- Original Message --------
Subject: PV index perhaps wrong in version 3.0
Date: Mon, 08 Sep 2008 14:35:34 +0200

L.S.,

Table 8.1 section 8, page 74 lists for the native longitude and latitude
of the celestial pole the keywords LONPOLEa= and LATPOLEa= which,
according to the table is equivalent to PVi_1a and PVi_2a.
However, in the same table these keywords were previously attached to
the fiducial point. Also Calabretta and Greisen use PVi_3a and PVi_4a in
their article 'Representations of celestial coordinates in FITS'.
Please can you inform me about what is right (i.e. standard FITS) in
this case?


I believe that the user is correct and _3 and _4 should be used. I was
hoping Mark Calabretta would confirm this.

Eric

 




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