lsst.afw.geom._calculateSipWcsHeader Namespace Reference

Functions
	calculateSipWcsHeader (wcs, order, bbox, spacing, header=None)

Function Documentation

calculateSipWcsHeader()

calculateSipWcsHeader	(		wcs,
			order,
			bbox,
			spacing,
			header = None )

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 30 of file _calculateSipWcsHeader.py.