make_gwcs#

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

Create a simple celestial gWCS object in the ICRS coordinate frame.

This function requires the gwcs package.

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:

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

See also

make_wcs

Notes

The make_wcs function returns an equivalent WCS transformation to this one, but as an astropy.wcs.WCS object.

Examples

>>> from photutils.datasets import make_gwcs
>>> shape = (100, 100)
>>> gwcs = make_gwcs(shape)
>>> print(gwcs)
  From      Transform
-------- ----------------
detector linear_transform
    icrs             None
>>> skycoord = gwcs.pixel_to_world(42, 57)
>>> print(skycoord)  
<SkyCoord (ICRS): (ra, dec) in deg
    (197.89278975, -1.36561284)>