[AstroPy] Bug in wcs_world2pix?
thomas.robitaille at gmail.com
Fri Sep 19 03:30:33 EDT 2014
I think the coordinates are exactly 180 degrees off - that is, (31, 26)
is the exact antipode of (211, -26). So it seems that there is still an
issue? If the RA got wrapped, it would be (-149, -26).
Michael Droettboom wrote:
> The range of ra and dec is (-180, 180) and (-90, 90) respectively.
> (211, -26) is equivalent to (31, 26).
> On 09/18/2014 05:04 PM, Maik Riechert wrote:
>> 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,
>> AstroPy mailing list
>> AstroPy at scipy.org
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