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# 

# LSST Data Management System 

# Copyright 2008, 2009, 2010 LSST Corporation. 

# 

# 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 <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

__all__ = ["setMatchDistance"] 

 

import lsst.afw.table as afwTable 

 

 

def setMatchDistance(matches): 

"""Set the distance field of the matches in a match list to the distance in radians on the sky 

 

@warning the coord field of the source in each match must be correct 

 

@param[in,out] matches a list of matches, an instance of lsst.afw.table.ReferenceMatch 

reads the coord field of the source and reference object of each match 

writes the distance field of each match 

""" 

if len(matches) < 1: 

return 

 

sourceCoordKey = afwTable.CoordKey(matches[0].first.schema["coord"]) 

refObjCoordKey = afwTable.CoordKey(matches[0].second.schema["coord"]) 

for match in matches: 

sourceCoord = match.first.get(sourceCoordKey) 

refObjCoord = match.second.get(refObjCoordKey) 

match.distance = refObjCoord.separation(sourceCoord).asRadians()