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A natural approach to implementing such systems is to
use an existing query-based data collection system for sen-
sor networks. Through queries, a user can ask for the data
he or she is interested in without concern for the technical
details of how that data will be retrieved or processed. A
number of research projects, including Cougar [31], Di-
rected Diffusion [12], and TinyDB [19,20] have advocated
a query-based interface to sensornets, and several imple-
mentations of query systems have been built and deployed.
Unfortunately, these existing query systems do not pro-
vide an efficient way to evaluate...
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