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1# 

2# LSST Data Management System 

3# 

4# Copyright 2008-2017 AURA/LSST. 

5# 

6# This product includes software developed by the 

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

8# 

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

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

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

12# (at your option) any later version. 

13# 

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

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

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

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

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

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

22# 

23__all__ = ["makeCoaddApCorrMap", ] 

24 

25from lsst.afw.image import ApCorrMap 

26from .coaddBoundedField import CoaddBoundedField, CoaddBoundedFieldElement 

27 

28 

29def makeCoaddApCorrMap(catalog, coaddBox, coaddWcs, weightFieldName="weight"): 

30 """Construct an ApCorrMap for a coadd 

31 

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

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

34 @param coaddWcs: Wcs for coadd 

35 @param weightFieldName: name of weight field in catalog 

36 @return aperture corrections 

37 """ 

38 

39 # Assemble the BoundedFields for each type 

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

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

42 for row in catalog: 

43 apCorrMap = row.getApCorrMap() 

44 if not apCorrMap: 

45 continue 

46 weight = row.get(weightKey) 

47 wcs = row.getWcs() 

48 validPolygon = row.getValidPolygon() 

49 for name, bf in apCorrMap.items(): 

50 if name not in everything: 

51 everything[name] = [] 

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

53 

54 # Construct a CoaddBoundedField for each type 

55 apCorrMap = ApCorrMap() 

56 for name, elements in everything.items(): 

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

58 

59 return apCorrMap