lsst.afw.math.warper Namespace Reference

Classes
class	WarperConfig
class	Warper

Functions
def	computeWarpedBBox

Variables
list	__all__ = ["Warper", "WarperConfig"]
int	_DefaultInterpLength = 10
int	_DefaultCacheSize = 0

Function Documentation

def lsst.afw.math.warper.computeWarpedBBox	(		destWcs,
			srcBBox,
			srcWcs
	)

Compute the bounding box of a warped image

The bounding box includes all warped pixels and it may be a bit oversize.

@param destWcs: WCS of warped exposure
@param srcBBox: parent bounding box of unwarped image
@param srcWcs: WCS of unwarped image

@return destBBox: bounding box of warped exposure

Definition at line 30 of file warper.py.

def computeWarpedBBox(destWcs, srcBBox, srcWcs):
    """Compute the bounding box of a warped image
    
    The bounding box includes all warped pixels and it may be a bit oversize.
    
    @param destWcs: WCS of warped exposure
    @param srcBBox: parent bounding box of unwarped image
    @param srcWcs: WCS of unwarped image

    @return destBBox: bounding box of warped exposure
    """
    srcPosBox = afwGeom.Box2D(srcBBox)
    destPosBox = afwGeom.Box2D()
    for inX in (srcPosBox.getMinX(), srcPosBox.getMaxX()):
        for inY in (srcPosBox.getMinY(), srcPosBox.getMaxY()):
            destPos = destWcs.skyToPixel(srcWcs.pixelToSky(afwGeom.Point2D(inX, inY)))
            destPosBox.include(destPos)
    destBBox = afwGeom.Box2I(destPosBox, afwGeom.Box2I.EXPAND)
    return destBBox