comp.lang.idl-pvwave archive: archive » Re: WCS Coordinates not kept with WRITEFITS

Home » Public Forums » archive » Re: WCS Coordinates not kept with WRITEFITS

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: WCS Coordinates not kept with WRITEFITS [message #68980 is a reply to message #68979]

Thu, 10 December 2009 07:30

jeanh
Messages: 79
Registered: November 2009

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,

Hi,

you are saving the header of your big file along with the data of your
small file... it can not work. You would have to update the header
information (sorry, I don't use fits files so I can't help you on this
one). Mainly, the new coordinate of your top left (could be another
corner) corner is needed, as the resolution and map info should be the
same.

Jean

Report message to a moderator

[Message index]

		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

Previous Topic:	ittlicense crash
Next Topic:	significant digits represented with plot

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 20:07:53 PDT 2025

Total time taken to generate the page: 0.55367 seconds