comp.lang.idl-pvwave archive: archive » Shifted origin using Polywarp and Poly

Home » Public Forums » archive » Shifted origin using Polywarp and Poly_2d

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

Re: Shifted origin using Polywarp and Poly_2d [message #56831 is a reply to message #56749]

Wed, 14 November 2007 06:42

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Nov 13, 5:42 pm, jds...@udel.edu wrote:
> Hi,
>
> I have some 2k x 2k astronomical images for which I need to correct
> the astrometry. I've tried using POLYWARP and POLY_2D, but they dont
> give good results as there is a reference pixel that should not be
> moved. The reference pixel is near the middle of the image ( e.g.
> [1079.51, 1007.41]) that corresponds to a particular celestial
> coordinate.

I don't quite understand what you are doing -- what are you using to
correct the astroemtry? if the reference pixel is one of the grid
point in polywarp then it shouldn't be moving.

You might want to look at hastrom.pro ( http://idlastro.gsfc.nasa.gov/ftp/pro/astrom/hastrom.pro
) which might either already be doing what you need, or provide some
hints.

If instead, you have a list of star X,Y and celestial positions you
could try astromit.pro http://idlastro.gsfc.nasa.gov/ftp/contrib/landsman/mousse/as tromit.pro
- it also need astrom.pro) or you could use the very cool software at
http://astrometry.net. Note that once you have an astrometric
solution, you can set the reference pixel to anything you want.

--Wayne

Report message to a moderator

[Message index]

		Shifted origin using Polywarp and Poly_2d By: jdshaw on Tue, 13 November 2007 14:42
		Re: Shifted origin using Polywarp and Poly_2d By: wlandsman on Wed, 14 November 2007 06:42

Previous Topic:	Removing Table Widget Column Labels
Next Topic:	Calling f90 subroutine from IDL

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 13:49:25 PDT 2025

Total time taken to generate the page: 1.51950 seconds