[fitsbits] polar coordinates

[Phil Hodge]

Walter,

Aside from the log, isn't this the ARC projection with CRVAL1 and CRVAL2 
set to the right ascension and declination at the center of the 
(theoretical) disk?

Phil

On 12/11/2013 08:19 AM, Walter Jaffe wrote:
> I find nothing in the FITS standard document about representing the sky
> in polar coordinates.  One of my clients wishes to represent a
> theoretical model of disk emission in polar logarithmic coordinates.
> In other words CTYPE1 is LOG(RADIUS) (common log of
> radius in degrees on the sky) and
> CTYPE2 is PA (or POSITION ANGLE), (degrees E from North).
>
> Has this been discussed before?  Is there a straightforward
> convention?
>
> Walter
>
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