Generate a SIP WCS header approximating a given ``SkyWcs``
Parameters
----------
wcs : `lsst.afw.geom.SkyWcs`
World Coordinate System to approximate as SIP.
order : `int`
SIP order (equal to the maximum sum of the polynomial exponents).
bbox : `lsst.geom.Box2I`
Bounding box over which to approximate the ``wcs``.
spacing : `float`
Spacing between sample points.
header : `lsst.daf.base.PropertyList`, optional
Header to which to add SIP WCS keywords.
Returns
-------
header : `lsst.daf.base.PropertyList`
Header including SIP WCS keywords.
Examples
--------
>>> header = calculateSipWcsHeader(exposure.getWcs(), 3, exposure.getBBox(), 20)
>>> sipWcs = SkyWcs(header)
Definition at line 8 of file calculateSipWcsHeader.py.