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# 

# LSST Data Management System 

# 

# Copyright 2008-2017 AURA/LSST. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <https://www.lsstcorp.org/LegalNotices/>. 

# 

__all__ = ["makeCoaddApCorrMap", ] 

 

from lsst.afw.image import ApCorrMap 

from .coaddBoundedField import CoaddBoundedField, CoaddBoundedFieldElement 

 

 

def makeCoaddApCorrMap(catalog, coaddBox, coaddWcs, weightFieldName="weight"): 

"""Construct an ApCorrMap for a coadd 

 

@param catalog: Table of coadd inputs (lsst.afw.table.ExposureCatalog) 

@param coaddBox: Bounding box for coadd (lsst.geom.Box2I) 

@param coaddWcs: Wcs for coadd 

@param weightFieldName: name of weight field in catalog 

@return aperture corrections 

""" 

 

# Assemble the BoundedFields for each type 

everything = {} # name --> list of CoaddBoundedFieldElement 

weightKey = catalog.schema[weightFieldName].asKey() 

for row in catalog: 

apCorrMap = row.getApCorrMap() 

44 ↛ 45line 44 didn't jump to line 45, because the condition on line 44 was never true if not apCorrMap: 

continue 

weight = row.get(weightKey) 

wcs = row.getWcs() 

validPolygon = row.getValidPolygon() 

for name, bf in apCorrMap.items(): 

if name not in everything: 

everything[name] = [] 

everything[name].append(CoaddBoundedFieldElement(bf, wcs, validPolygon, weight)) 

 

# Construct a CoaddBoundedField for each type 

apCorrMap = ApCorrMap() 

for name, elements in everything.items(): 

apCorrMap.set(name, CoaddBoundedField(coaddBox, coaddWcs, elements)) 

 

return apCorrMap