This is a thin wrapper around the high- and mid-level interfaces of Dr. Mark Calabretta's WCSLIB for handling the World Coordinate System.

In addition, there are extensions (written in C) to support Spitzer Simple Imaging Polynomial (SIP) convention keywords and Paper IV table lookup distortion.

Note that the development of this package has been stopped in favour of the astropy package. The astropy package offers a fully compatible superset of pywcs as module `astropy.wcs`.