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Shifted origin using Polywarp and Poly_2d [message #56749]

Tue, 13 November 2007 14:42

jdshaw
Messages: 7
Registered: October 2007

Junior Member

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 get much better agreement when I shift the origin to the reference
coordinate for my reference vectors as the distance from the reference
pixel is related to how much the coordinate shifts. I can get a good
set of matrices from Polywarp this way (much better than having the
origin at the corner of the image), but I am not sure how to get
POLY_2D to warp around a point that is not [0,0].

Any suggestions would be appreciated.

Thanks - John

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[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

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