to spatial units. When s=0, the temporal distance drops out and TSD is equivalent to Euclidean distance (thus T-LoCoH is backward compatible with LoCoH). As s increases, the temporal distance becomes more and more influential, eventually swamping out the distance in space. The TSD metric is not based on a mechanistic or diffusion model of movement, but merely serves to generate hulls that are local in space and/or time. References Spatial analysis Convex hulls