Finds the nearest 3-dimensional matches of a coordinate or coordinates in a set of catalog coordinates.
This finds the 3-dimensional closest neighbor, which is only different from the on-sky distance if distance is set in either matchcoord or catalogcoord.
Parameters : | matchcoord : SphericalCoordinatesBase
catalogcoord : SphericalCoordinatesBase
nthneighbor : int, optional
storekdtree : bool or str, optional
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Returns : | idx : integer array
sep2d : Angle
dist3d : Quantity
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Notes
This function requires scipy to be installed or it will fail.