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Re: FITS WCS routines [message #72246 is a reply to message #72242]

Thu, 19 August 2010 14:02

Chris[7]
Messages: 4
Registered: August 2010

Junior Member

I would also love to see the IDL astro WCS procedures handle
N-dimensional (or at least 3 dimensional) image arrays. I've had to
write clumsy wrappers to extract coordinate information from spectral
data cubes.

chris

On 8/19/10 10:49 AM, wlandsman wrote:
> On Aug 19, 3:51 pm, Jeremy Bailin<astroco...@gmail.com> wrote:
>> Does anyone know of a good IDL implementation or wrapper of up-to-date
>> routines to deal with world coordinate systems in FITS files? The ones
>> in the astronomy library aren't sufficient - in particular, I need
>> something that can deal with a TNX coordinate system (tangent point
>> plane with distortions).
>
> Well, to be fair, there is no established standard yet for
> representing distortions within FITS. (There is a draft standard
> that has been in the works for at least 10 years -- but nobody uses
> it ( see Paper IV in
> http://www.atnf.csiro.au/people/mcalabre/WCS/index.html )
>
> The TNX distortion keywords and convention were created by the IRAF
> software group ( http://fits.gsfc.nasa.gov/registry/tnx.html ). I
> have implemented a more popular distortion convention -- the Simple
> Imaging Polynomial or SIP (
> http://fits.gsfc.nasa.gov/registry/sip.html ) in the Astronomy
> Library. Unfortunately, that won't help you if you are given files
> using the TNX keywords.
>
> I think I once saw IDL code for parsing the TNX keywords but I can't
> remember where just now. Perhaps someone else will have idea. --
> Wayne

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[Message index]

		Re: FITS WCS routines By: Jeremy Bailin on Sat, 21 August 2010 12:50
		Re: FITS WCS routines By: Jeremy Bailin on Fri, 20 August 2010 06:09
		Re: FITS WCS routines By: Chris[7] on Thu, 19 August 2010 14:02
		Re: FITS WCS routines By: wlandsman on Thu, 19 August 2010 13:49

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