make_wcs#

photutils.datasets.make_wcs(shape, galactic=False)[source]#

Create a simple celestial WCS object in either the ICRS or Galactic coordinate frame.

Parameters:

shape2-tuple of int: The shape of the 2D array to be used with the output WCS object.
galacticbool, optional: If True, then the output WCS will be in the Galactic coordinate frame. If False (default), then the output WCS will be in the ICRS coordinate frame.

Returns:

wcsastropy.wcs.WCS object: The world coordinate system (WCS) transformation.

See also

make_gwcs

Notes

The make_gwcs function returns an equivalent WCS transformation to this one, but as a gwcs.wcs.WCS object.

Examples

>>> from photutils.datasets import make_wcs
>>> shape = (100, 100)
>>> wcs = make_wcs(shape)
>>> print(wcs.wcs.crpix)  
[50. 50.]
>>> print(wcs.wcs.crval)  
[197.8925      -1.36555556]
>>> skycoord = wcs.pixel_to_world(42, 57)
>>> print(skycoord)  
<SkyCoord (ICRS): (ra, dec) in deg
    (197.89278975, -1.36561284)>