wcs_to_celestial_frame

astropy.wcs.utils.wcs_to_celestial_frame(wcs)

For a given WCS, return the coordinate frame that matches the celestial component of the WCS.

Parameters

wcsWCS instance

The WCS to find the frame for

Returns

frameBaseCoordinateFrame subclass instance

An instance of a BaseCoordinateFrame subclass instance that best matches the specified WCS.

Notes

To extend this function to frames not defined in astropy.coordinates, you can write your own function which should take a WCS instance and should return either an instance of a frame, or None if no matching frame was found. You can register this function temporarily with:

>>> from astropy.wcs.utils import wcs_to_celestial_frame, custom_wcs_to_frame_mappings
>>> with custom_wcs_to_frame_mappings(my_function):
...     wcs_to_celestial_frame(...)