wcs cdelt
when setting a wcs object with cdelt, the cdelt keyword is not updated:
In [29]: wcs=obj.WCS(cdelt=(0.2/3600,-0.2/3600),crpix=7,crval=0.,deg=True,shape=(15,15))
In [30]: wcs
Out[30]:
WCS Keywords
Number of WCS axes: 2
CTYPE : 'RA---TAN' 'DEC--TAN'
CRVAL : 0.0 0.0
CRPIX : 7.0 7.0
PC1_1 PC1_2 : -5.555555555555556e-05 -0.0
PC2_1 PC2_2 : -0.0 5.555555555555556e-05
CDELT : 1.0 1.0
NAXIS : 15 15