[AstroPy] Error in pixel to sky coordinate conversion with astropy.wcs

[Josh Walawender]

Hi Angelo,

I ran in to the same problem in some python code I’m writing (needing to work with SCAMP generated distortion info).  The easiest way to deal with it that I found was to rectify the image with SWarp (also from Emmanuel Bertin author of SCAMP, so they work together seamlessly).  After that what’s left is an image with a simple CDn_m matrix which any software can handle.

http://www.astromatic.net/software/swarp

cheers,
Josh



On Apr 29, 2014, at 11:44 AM, Angelo Varlotta <avarlotta at cfa.harvard.edu> wrote:

> Hello,
> Thanks a lot for the help. I've installed PyAST on my computer and I'm now trying to understand how to implement the coordinate transformation I need. Is anyone familar with PyAST and if so, can anyone suggest the code to transform from pixel to sky coordinates and viceversa?
> 
> Cheers,
> Angelo
> 
> Kyle Barbary wrote:
>> 
>> Here's more information that you'd probably want to know:
>> 
>> https://github.com/astropy/astropy/issues/299
>> 
>> The short answer is that the PVi_j keywords used by SCAMP are not supported by astropy.wcs, so there's not much you can do except to use a different tool.
>> - Kyle
>> 
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