def checkTract(self, cache, tractId, selectIdList):
"""!Check whether a tract has any overlapping inputs
This method only runs on slave nodes.
@param cache: Pool cache
@param tractId: Data identifier for tract
@param selectDataList: List of selection data
@return whether tract has any overlapping inputs
"""
skymap = cache.skymap
tract = skymap[tractId]
tractWcs = tract.getWcs()
tractPoly = convexHull([tractWcs.pixelToSky(afwGeom.Point2D(coord)).getVector() for
coord in tract.getBBox().getCorners()])
for selectData in selectIdList:
if not hasattr(selectData, "poly"):
wcs = selectData.wcs
dims = selectData.dims
box = afwGeom.Box2D(afwGeom.Point2D(0, 0), afwGeom.Point2D(*dims))
selectData.poly = convexHull([wcs.pixelToSky(coord).getVector()
for coord in box.getCorners()])
if tractPoly.intersects(selectData.poly):
return True
return False
def runDataRef(self, dataRef, coordList, makeDataRefList=True, selectDataList=[]):
"""Select images in the selectDataList that overlap the patch
We use the "convexHull" function in the geom package to define
polygons on the celestial sphere, and test the polygon of the
patch for overlap with the polygon of the image.
We use "convexHull" instead of generating a SphericalConvexPolygon
directly because the standard for the inputs to SphericalConvexPolygon
are pretty high and we don't want to be responsible for reaching them.
If "convexHull" is found to be too slow, we can revise this.
@param dataRef: Data reference for coadd/tempExp (with tract, patch)
@param coordList: List of Coord specifying boundary of patch
@param makeDataRefList: Construct a list of data references?
@param selectDataList: List of SelectStruct, to consider for selection
"""
from lsst.geom import convexHull
dataRefList = []
exposureInfoList = []
patchVertices = [coord.getVector() for coord in coordList]
patchPoly = convexHull(patchVertices)
for data in selectDataList:
dataRef = data.dataRef
imageWcs = data.wcs
nx,ny = data.dims
imageBox = afwGeom.Box2D(afwGeom.Point2D(0,0), afwGeom.Extent2D(nx, ny))
try:
imageCorners = [imageWcs.pixelToSky(pix) for pix in imageBox.getCorners()]
except (pexExceptions.DomainError, pexExceptions.RuntimeError) as e:
# Protecting ourselves from awful Wcs solutions in input images
self.log.logdebug("WCS error in testing calexp %s (%s): deselecting" % (dataRef.dataId, e))
continue
imagePoly = convexHull([coord.getVector() for coord in imageCorners])
if imagePoly is None:
self.log.logdebug("Unable to create polygon from image %s: deselecting" % dataRef.dataId)
continue
if patchPoly.intersects(imagePoly): # "intersects" also covers "contains" or "is contained by"
self.log.info("Selecting calexp %s" % dataRef.dataId)
dataRefList.append(dataRef)
exposureInfoList.append(BaseExposureInfo(dataRef.dataId, imageCorners))
return pipeBase.Struct(
dataRefList = dataRefList if makeDataRefList else None,
exposureInfoList = exposureInfoList,
)
def overlapsTract(tract, imageWcs, imageBox):
"""Return whether the image (specified by Wcs and bounding box) overlaps the tract
@param tract: TractInfo specifying a tract
@param imageWcs: Wcs for image
@param imageBox: Bounding box for image
@return bool
"""
tractWcs = tract.getWcs()
tractCorners = [tractWcs.pixelToSky(lsst.afw.geom.Point2D(coord)).getVector() for
coord in tract.getBBox().getCorners()]
tractPoly = convexHull(tractCorners)
try:
imageCorners = [imageWcs.pixelToSky(lsst.afw.geom.Point2D(pix)) for pix in imageBox.getCorners()]
except lsst.pex.exceptions.LsstCppException, e:
# Protecting ourselves from awful Wcs solutions in input images
if (not isinstance(e.message, lsst.pex.exceptions.DomainErrorException) and
not isinstance(e.message, lsst.pex.exceptions.RuntimeErrorException)):
raise
return False
for tractSet in visitTract.itervalues():
tractCounter.update(tractSet)
log.info("Number of visits for each tract: %s" % (dict(tractCounter),))
def overlapsTract(tract, imageWcs, imageBox):
"""Return whether the image (specified by Wcs and bounding box) overlaps the tract
@param tract: TractInfo specifying a tract
@param imageWcs: Wcs for image
@param imageBox: Bounding box for image
@return bool
"""
tractWcs = tract.getWcs()
tractCorners = [tractWcs.pixelToSky(lsst.afw.geom.Point2D(coord)).getVector() for
coord in tract.getBBox().getCorners()]
tractPoly = convexHull(tractCorners)
try:
imageCorners = [imageWcs.pixelToSky(lsst.afw.geom.Point2D(pix)) for pix in imageBox.getCorners()]
except lsst.pex.exceptions.LsstCppException, e:
# Protecting ourselves from awful Wcs solutions in input images
if (not isinstance(e.message, lsst.pex.exceptions.DomainErrorException) and
not isinstance(e.message, lsst.pex.exceptions.RuntimeErrorException)):
raise
return False
imagePoly = convexHull([coord.getVector() for coord in imageCorners])
if imagePoly is None:
return False
return tractPoly.intersects(imagePoly) # "intersects" also covers "contains" or "is contained by"
def runDataRef(self,
dataRef,
coordList,
makeDataRefList=True,
selectDataList=[]):
"""Select images in the selectDataList that overlap the patch
We use the "convexHull" function in the geom package to define
polygons on the celestial sphere, and test the polygon of the
patch for overlap with the polygon of the image.
We use "convexHull" instead of generating a SphericalConvexPolygon
directly because the standard for the inputs to SphericalConvexPolygon
are pretty high and we don't want to be responsible for reaching them.
If "convexHull" is found to be too slow, we can revise this.
@param dataRef: Data reference for coadd/tempExp (with tract, patch)
@param coordList: List of Coord specifying boundary of patch
@param makeDataRefList: Construct a list of data references?
@param selectDataList: List of SelectStruct, to consider for selection
"""
from lsst.geom import convexHull
dataRefList = []
exposureInfoList = []
patchVertices = [coord.getVector() for coord in coordList]
patchPoly = convexHull(patchVertices)
for data in selectDataList:
dataRef = data.dataRef
imageWcs = data.wcs
nx, ny = data.dims
imageBox = afwGeom.Box2D(afwGeom.Point2D(0, 0),
afwGeom.Extent2D(nx, ny))
try:
imageCorners = [
imageWcs.pixelToSky(pix) for pix in imageBox.getCorners()
]
except (pexExceptions.DomainError,
pexExceptions.RuntimeError) as e:
# Protecting ourselves from awful Wcs solutions in input images
self.log.debug(
"WCS error in testing calexp %s (%s): deselecting",
dataRef.dataId, e)
continue
imagePoly = convexHull(
[coord.getVector() for coord in imageCorners])
if imagePoly is None:
self.log.debug(
"Unable to create polygon from image %s: deselecting",
dataRef.dataId)
continue
if patchPoly.intersects(
imagePoly
): # "intersects" also covers "contains" or "is contained by"
self.log.info("Selecting calexp %s" % dataRef.dataId)
dataRefList.append(dataRef)
exposureInfoList.append(
BaseExposureInfo(dataRef.dataId, imageCorners))
return pipeBase.Struct(
dataRefList=dataRefList if makeDataRefList else None,
exposureInfoList=exposureInfoList,
)