[AstroPy] Bug in wcs_world2pix?

[Dominik Klaes]

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Hi Maik,

try instead of this

x,y = wcs.wcs_world2pix(211, -26, 0)

this

x,y = wcs.wcs_world2pix([[211, -26]], 0), also in the transformation back. Does this help? I remember that I had a similar problem.

Cheers,

Dominik

On 18. September 2014 23:04:17 MESZ, Maik Riechert <maik.riechert at arcor.de> wrote:
>Hi,
>
>I'm having some great trouble currently and am a bit confused too:
>
>wcs = WCS(header)
>x,y = wcs.wcs_world2pix(211, -26, 0)
>print x,y # 836.316942718 658.26364248
>ra,dec = wcs.wcs_pix2world(x, y, 0)
>print ra, dec # 31.0 26.0
>
>It seems like world2pix gives me bogus results. I was expecting values
>way outside my image area (image size is 4256x2832). Am I doing
>something obvious wrong?
>
>The WCS headers can be seen at http://pastebin.com/JrdiL949
>
>Thanks for the help,
>Maik
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>AstroPy mailing list
>AstroPy at scipy.org
>http://mail.scipy.org/mailman/listinfo/astropy
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