[AstroPy] Pywcs not reading transformation matrix correctly
Thu Jul 26 12:21:48 CDT 2012
That fixed it - I guess that it was an already-squashed bug.
Thanks for your help.
On Jul 26, 2012, at 10:15 AM, Oliver King wrote:
> This might be the reason:
> I'll try updating to the latest version.
> On Jul 26, 2012, at 10:10 AM, Thomas Robitaille wrote:
>> Which version of Astropy are you using?
>> import astropy
>> print astropy.__version__
>> I'm using the latest developer version, and it seems to be working:
>> CD_11 CD_12: -7.7588993045300006e-05 4.5042903792000001e-07
>> CD_21 CD_22: -3.9690360471000002e-07 -7.7631469153300006e-05
>> CRVAL : 343.48506545599997 16.146689138399999
>> CRPIX : 1094.26737976 1037.5606839899999
>> NAXIS : 0.0 0.0
>> If you are using v0.1, could you try updating to the latest git
>> version to see if it was fixed?
>> On 26 July 2012 19:03, Oliver King <email@example.com> wrote:
>>> Hi JB,
>>> The WCS does not have a RADECSYS keyword; the CTYPE is TAN-SIP. Here are all the WCS parameters (excluding the polynomial coefficients). This is an image which has had a WCS attached by the astrometry.net software.
>>> CTYPE1 = 'RA---TAN-SIP' / TAN (gnomic) projection + SIP distortions
>>> CTYPE2 = 'DEC--TAN-SIP' / TAN (gnomic) projection + SIP distortions
>>> WCSAXES = 2 / no comment
>>> EQUINOX = 2000.0 / Equatorial coordinates definition (yr)
>>> LONPOLE = 180.0 / no comment
>>> LATPOLE = 0.0 / no comment
>>> CRVAL1 = 343.485065456 / RA of reference point
>>> CRVAL2 = 16.1466891384 / DEC of reference point
>>> CRPIX1 = 1094.26737976 / X reference pixel
>>> CRPIX2 = 1037.56068399 / Y reference pixel
>>> CUNIT1 = 'deg ' / X pixel scale units
>>> CUNIT2 = 'deg ' / Y pixel scale units
>>> CD1_1 = -7.75889930453E-05 / Transformation matrix
>>> CD1_2 = 4.5042903792E-07 / no comment
>>> CD2_1 = -3.9690360471E-07 / no comment
>>> CD2_2 = -7.76314691533E-05 / no comment
>>> IMAGEW = 2048 / Image width, in pixels.
>>> IMAGEH = 2048 / Image height, in pixels.
>>> On Jul 26, 2012, at 9:58 AM, Jean-Baptiste Marquette wrote:
>>>> Hi Oliver,
>>>>> Is this a known bug? Is there a workaround or do I need to manually edit my FITS file headers?
>>>> What are your CTYPEn and RADECSYS ?
>>> Oliver King
>>> Astronomy Department, Caltech
>>> AstroPy mailing list
> Oliver King
> Astronomy Department, Caltech
> AstroPy mailing list
Astronomy Department, Caltech
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