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Re: WCS Coordinates not kept with WRITEFITS [message #68979]

Thu, 10 December 2009 07:30

Bringfried Stecklum is currently offline

Bringfried Stecklum
Messages: 75
Registered: January 1996

Member

Laurence wrote:
> Hi,
> I am writing because I have a problem while creating new fits files
> and I could not find any similar topic on the web.
> Basically, I simply cut a small region from a larger fit file and save
> it with writefits .
>
> im1=readfits('pp.fit',hdr)
> temp1='p.fit'
> imnew1=fltarr(2000,2000)
> imnew1=im1(3303:3512,3095:3293)
> writefits,temp1,imnew1,hdr
>
> But in the newly created .fit file, the coordinates are off and then
> wrong !
> Is there a way to solve this ? (I have idl_6.0 )
>
> Thanks,
Of course, since the header needs to be updated as well to account for the size
and WCS change. The routine hextract from the IDL Astro Lib does the job of
extracting FITS subimages, see

http://idlastro.gsfc.nasa.gov/ftp/pro/astrom/hextract.pro

Regards,

Bringfried

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		Re: WCS Coordinates not kept with WRITEFITS By: Bringfried Stecklum on Thu, 10 December 2009 07:30
		Re: WCS Coordinates not kept with WRITEFITS By: jeanh on Thu, 10 December 2009 07:30
		Re: WCS Coordinates not kept with WRITEFITS By: Laurence on Tue, 15 December 2009 11:02

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