calculateSipWcsHeader¶
-
lsst.afw.geom.
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)
- wcs :