7. A method as in claim 6 further including the steps of: performing segmentation on each of said character strings to partition said strings into a plurality of segments; extracting a plurality of values from said segments corresponding to static properties in said segments; and forming said feature vectors from said plurality of values.
6. A method as in claim 3 further including the step of: creating an upper triangular matrix to store each of said distance values calculated for said each pair of said first plurality of trajectories.