A computer implemented method for evaluating a one-to-one mapping between a first spatial point set and a second spatial point set in nD comprising the steps of receiving a first and a second spatial point sets and a one-to-one mapping between the two spatial point sets; defining a spatial agent; generating multiple mapped (n+1)-combinations in the first point set; computing multiple affine transformations that transform the multiple mapped (n+1)-combinations to correspondents in the second point set; applying the multiple affine transformations to the spatial agent to generate multiple transformed spatial agents; and computing a distance measure using the multiple transformed spatial agents.