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Data collection is a fundamental task in wireless sensor networks. Sensor networks are collection of sensor nodes which cooperatively send sensed data to the base station. As sensor nodes are battery driven, an efficient utilization of power is essential in order to use network for long duration, hence it is needed to reduce data traffic inside sensor networks. In this paper, the authors are focusing on approximate data collection that will enhance the lifetime of the wireless sensor network. The key idea of Approximate Data collection, is to divide a sensor network into clusters, in which each cluster will have many cluster members and a single cluster head.
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