[AstroPy] Rotate an image and create new FITS header with updated astrometry

[Marcio Melendez]

Yes, that would be great. Once there is a solution to the problem, I can
post an update with the solution so other Astropy users can benefit.

On Wed, Nov 16, 2016 at 11:16 AM, Simon Conseil <simon at sconseil.fr> wrote:

>
>
> Le 16/11/2016 à 16:55, Marcio Melendez a écrit :
>
> Hi Simon,
> It looks like a very nice software, thanks for sharing. I started to play
> around with it but  a simple read an image and then rotate, got me an error
> (see below). I need to open a ticket for this issue in the MPDAF webpage,
> however it seems very inconvenient as you need to create an account with
> CRAL first.
>
>
> Yes, sorry about that ..
> But we also have a mailing list, I can transfer you email there to avoid
> spamming Astropy's list, and try to find the bug (we use mostly MUSE and
> HST data so it is possible that some wcs stuff is not well handled for your
> data).
>
> Simon
>
>
>
>
>   File "<stdin>", line 1, in <module>
>
>   File "/Users/<username>/anaconda/lib/python3.4/site-packages/mpdaf/obj/image.py",
> line 1272, in rotate
>
>     cutoff=cutoff)
>
>   File "/Users/<username>/anaconda/lib/python3.4/site-packages/mpdaf/obj/image.py",
> line 1161, in _rotate
>
>     self.wcs.set_cd(newcd)
>
>   File "/Users/<username>/anaconda/lib/python3.4/site-packages/mpdaf/obj/coords.py",
> line 1303, in set_cd
>
>     self.wcs.wcs.crota = image_angle_from_cd(cd, u.deg)
>
> ValueError: object of too small depth for desired array
>
>
>
> On Wed, Nov 16, 2016 at 9:13 AM, Simon Conseil <simon at sconseil.fr> wrote:
>
>> Hi all,
>>
>> We have some code to rotate an image with a given angle:
>>
>> http://mpdaf.readthedocs.io/en/latest/image.html#image-geome
>> trical-manipulation
>>
>> http://mpdaf.readthedocs.io/en/latest/api/mpdaf.obj.Image.ht
>> ml#mpdaf.obj.Image.rotate
>>
>> It uses scipy.ndimage.affine_transform, and should give the same result
>> as reproject, which uses scipy.ndimage.map_coordinates (both rely on
>> ndimage.geometric_transform). It would be interesting to compare !
>>
>> Cheers,
>>
>> Simon
>>
>>
>>
>> Le 16/11/2016 à 13:46, Brigitta Sipocz a écrit :
>>
>>
>> Hi Marcio,
>>
>> While it doesn't do exactly what you ask for, you may want to check out
>> the affiliated package reproject (http://reproject.readthedocs.
>> io/en/stable/). It does flux conserving image reprojection:
>>
>> http://reproject.readthedocs.io/en/stable/
>>
>> Cheers,
>>  Brigitta
>>
>> On 15 November 2016 at 14:26, Marcio Melendez <marcio.melendez at gmail.com>
>> wrote:
>>
>>> Hi all,
>>> Is there a similar function to IDL's  HROT in python, e.g., a function
>>> to rotate an image and create a new FITS header with updated astrometry.
>>>
>>> Thanks!
>>>
>>> --
>>> Marcio B. Melendez, Ph.D
>>> JWST ISIM Optics Support Scientist
>>> KBRwyle Science, Technology and Engineering Group
>>> NASA Goddard Space Flight Center  Greenbelt, MD  20771
>>> Bldg. 29 Rm. T29-10, phone: 301-286-8517
>>>
>>> _______________________________________________
>>> AstroPy mailing list
>>> AstroPy at scipy.org
>>> https://mail.scipy.org/mailman/listinfo/astropy
>>>
>>>
>>
>>
>>
>>
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>
> --
> Marcio B. Melendez, Ph.D
> JWST ISIM Optics Support Scientist
> KBRwyle Science, Technology and Engineering Group
> NASA Goddard Space Flight Center  Greenbelt, MD  20771
> Bldg. 29 Rm. T29-10, phone: 301-286-8517
>
> _______________________________________________
> AstroPy mailing listAstroPy at scipy.orghttps://mail.scipy.org/mailman/listinfo/astropy
>
>
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>
>


-- 
Marcio B. Melendez, Ph.D
JWST ISIM Optics Support Scientist
KBRwyle Science, Technology and Engineering Group
NASA Goddard Space Flight Center  Greenbelt, MD  20771
Bldg. 29 Rm. T29-10, phone: 301-286-8517
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