1. A method of identifying an observation pattern comprising the steps of: (a) dividing a locality into a plurality of geographic localities, wherein a plurality of sensor can each sense in at least one or more of the geographic localities within the locality; (b) identifying activity distribution based on detecting activity of one or more object in one or more of the plurality of geographic localities; (c) identifying one or more temporal activity segment based on activity distribution over a time period; and (d) identifying the observation pattern based on the one or more temporal activity segment.