1. A method for estimating the activity topology of a set of sensed data windows in a networked system of sensors, each of the sensed data windows related to a corresponding sensed region associated with a given sensor, the method including the steps: determining a subset of sensed data windows having corresponding sensed regions that are not connected by comparing sensed data windows pair wise from the set of sensed data windows; and excluding the subset of sensed data windows that are not connected from the set of sensed data windows thereby eliminating these pairs of sensed data windows from the networked system of sensors and determining the active topology.