setMatchDistance.py
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1 #
2 # LSST Data Management System
3 # Copyright 2008, 2009, 2010 LSST Corporation.
4 #
5 # This product includes software developed by the
6 # LSST Project (http://www.lsst.org/).
7 #
8 # This program is free software: you can redistribute it and/or modify
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16 # GNU General Public License for more details.
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22
23 __all__ = ["setMatchDistance"]
24
25 import lsst.afw.table as afwTable
26
27
28 def setMatchDistance(matches):
29  """Set the distance field of the matches in a match list to the distance in
31
32  Parameters
33  ----------
34  matches : list of lsst.afw.table.ReferenceMatch
35  a list of matches, reads the coord field of the source and reference
36  object of each match writes the distance field of each match
37
38  Notes
39  -----
40  .. warning::
41  the coord field of the source in each match must be correct
42  """
43  if len(matches) < 1:
44  return
45
46  sourceCoordKey = afwTable.CoordKey(matches[0].first.schema["coord"])
47  refObjCoordKey = afwTable.CoordKey(matches[0].second.schema["coord"])
48  for match in matches:
49  sourceCoord = match.first.get(sourceCoordKey)
50  refObjCoord = match.second.get(refObjCoordKey)