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In this paper, the authors introduce the idea of snapshot queries for energy efficient data acquisition in sensor networks. Network nodes generate models of their surrounding environments that are used for electing, using a localized algorithm, a small set of representative nodes in the network. These representative nodes constitute a network snapshot and can be used to provide quick approximate answers to user queries while reducing substantially the energy consumption in the network. The authors present a detailed experimental study of their framework and algorithms, varying multiple parameters like the available memory of the sensor nodes, their transmission range, the network message loss etc.
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