Before revision: The value ranges from 1 (case of straight line) to infinity (case of a closed loop, where the shortest path length is zero or for an infinitely-long actual pathLeopold, Luna B., Wolman, M.G., and Miller, J.P., 1964, Fluvial Processes in Geomorphology, San Francisco, W.H.
After revision: The value ranges from 1 (case of straight line) to infinity (case of a closed loop, where the shtest path length is zero or for an infinitely-long actual pathLeopold, Luna B., Wolman, M.G., and Miller, J.P., 1964, Fluvial Processes in Geomorphology, San Francisco, W.H.