lsst.afw.math._warper Namespace Reference

Classes
class	WarperConfig
class	Warper

Functions
def	computeWarpedBBox (destWcs, srcBBox, srcWcs)

Function Documentation

computeWarpedBBox()

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.

Parameters
----------
destWcs : `lsst.afw.geom.SkyWcs`
    WCS of warped exposure
srcBBox : `lsst.geom.Box2I`
    parent bounding box of unwarped image
srcWcs : `lsst.afw.geom.SkyWcs`
    WCS of unwarped image

Returns
-------
destBBox: `lsst.geom.Box2I`
    bounding box of warped exposure

Definition at line 32 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.
 
    Parameters
    ----------
    destWcs : `lsst.afw.geom.SkyWcs`
        WCS of warped exposure
    srcBBox : `lsst.geom.Box2I`
        parent bounding box of unwarped image
    srcWcs : `lsst.afw.geom.SkyWcs`
        WCS of unwarped image
 
    Returns
    -------
    destBBox: `lsst.geom.Box2I`
        bounding box of warped exposure
    """
    srcPosBox = lsst.geom.Box2D(srcBBox)
    destPosBox = lsst.geom.Box2D()
    for inX in (srcPosBox.getMinX(), srcPosBox.getMaxX()):
        for inY in (srcPosBox.getMinY(), srcPosBox.getMaxY()):
            destPos = destWcs.skyToPixel(srcWcs.pixelToSky(inX, inY))
            destPosBox.include(destPos)
    destBBox = lsst.geom.Box2I(destPosBox, lsst.geom.Box2I.EXPAND)
    return destBBox