[AstroPy] Unnecessary warning "cdelt will be ignored since cd is present"

[Michael Droettboom]

Thanks for the report.  Indeed, it's a little too zealous in the warning.

There is a proposed fix here:

https://github.com/astropy/astropy/pull/1845

Mike

On 11/29/2013 06:06 AM, Maik Riechert wrote:
> Hi,
>
> I use astropy 0.3 and get the warning "cdelt will be ignored since cd is
> present" when I call wcs.printwcs() even though the FITS headers don't
> contain cdelt:
>
> SIMPLE  =                    T / Standard FITS file
> BITPIX  =                    8 / ASCII or bytes array
> NAXIS   =                    0 / Minimal header
> EXTEND  =                    T / There may be FITS ext
> WCSAXES =                    2 / no comment
> CTYPE1  = 'RA---TAN' / TAN (gnomic) projection
> CTYPE2  = 'DEC--TAN' / TAN (gnomic) projection
> EQUINOX =               2000.0 / Equatorial coordinates definition (yr)
> LONPOLE =                180.0 / no comment
> LATPOLE =                  0.0 / no comment
> CRVAL1  =        282.428453019 / RA  of reference point
> CRVAL2  =        36.6483063538 / DEC of reference point
> CRPIX1  =        1938.20328776 / X reference pixel
> CRPIX2  =        1163.46704102 / Y reference pixel
> CUNIT1  = 'deg     ' / X pixel scale units
> CUNIT2  = 'deg     ' / Y pixel scale units
> CD1_1   =     -0.0164029166118 / Transformation matrix
> CD1_2   =     0.00410727100937 / no comment
> CD2_1   =    -0.00410727100937 / no comment
> CD2_2   =     -0.0164029166118 / no comment
> IMAGEW  =                 4256 / Image width,  in pixels.
> IMAGEH  =                 2832 / Image height, in pixels.
> HISTORY...
> DATE    = '2013-11-29T11:55:49' / Date this file was created.
> COMMENT...
> END
>
> I know printwcs() is declared as an internal function and I don't get
> the message when I don't call printwcs(), but still, I thought I let you
> know, just in case.
>
> Cheers
> Maik
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