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- matchids(id1, id2)
- Match two sets of ids.
Returns:
ibest -- array of indices of i1 that match i2; -1 if no match
- matchidsorted(ids, targetid)
- Find id matches, return index in i1 that matches targetid; -1 if no match.
- matchjoin(si1, si2, ibest, sep=[], dict1={}, dict2={})
- Keep only elements that match in both catalogs.
Arguments:
si1 -- object with data arrays as attributes (e.g. si1.mag_auto, si1.id)
si2 -- object with data arrays as attributes
ibest -- indices of si1 that match si2 (in order of si2)
Keyword Arguments:
sep -- array of separations, will be added as an attribute to second object
dict1 -- dictionary of attributes for si1 (e.g. {'mag_auto':0,'id':1} )
dict2 -- dictionary of attributes for si2
The objects si1 and si2 would normally be sextractor objects returned
by sextutils.sextractor(). In that case, the column names are stored in
si1._d and si2._d. If the objects are not sextractor objects, the user can
provide separate dictionaries whose keys are the object attributes
that correspond to the numpy data arrays.
Returns:
s1, s2 -- object arrays that include only the matching objects contained
in both s1 and s2.
- matchpos(ra1, dec1, ra2, dec2, tol)
- Match two sets of ra,dec within a tolerance.
Longer catalog should go first
Arguments:
ra1 - Right Ascension decimal degrees (numpy array)
dec1 - Declination decimal degrees (numpy array)
ra2 - Right Ascension decimal degrees (numpy array)
dec2 - Declination decimal degrees (numpy array)
tol - Matching tolerance in decimal degrees.
Returns:
ibest - indices of the best matches within tol; -1 if no match within tol
sep - separations (defaults to tol if no match within tol)
- matchsorted(ra, dec, ra1, dec1, tol)
- Find closest ra,dec within tol to a target in an ra-sorted list of ra,dec.
Arguments:
ra - Right Ascension decimal degrees (numpy sorted in ascending order)
dec - Declination decimal degrees (numpy array)
ra1 - RA to match (scalar, decimal degrees)
ra1 - Dec to match (scalar, decimal degrees)
tol - Matching tolerance in decimal degrees.
Returns:
ibest - index of the best match within tol; -1 if no match within tol
sep - separation (defaults to tol if no match within tol)
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