Thu, 07 Oct 2010 16:51:53 -0700, Peter Tittmann wrote: [clip] > In [53]: test=spatial.KDTree.query_ball_tree(lasKDTree, 10.) It's an instance method. You should call it as >>> a = KDTree(points_a) >>> b = KDTree(points_b) >>> a.query_ball_tree(b, 10.) -- Pauli Virtanen