Researchers interested in spatial query processing in wireless sensor networks (WSNs) and query processing in spatial and geographical databases should include this paper in their reference lists. Instead of providing a superficial, general survey, the authors insightfully capture the key characteristics of the details in this field. For example, in the beginning, the authors point out the two major differences between spatial and traditional queries. One of the most important challenges in WSN processing lies in the messaging protocol used by the nodes within the network, where the goal is to save as much energy as possible because of the energy and resource constraints in WSNs. Based on this knowledge, the authors divide the entire query processing procedure into six stages: preprocessing, forwarding, dissemination, sensing, aggregation, and return.
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