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Outsourcing spatial databases, including both road networks and points of interest, to a third party Cloud service provider has attracted much attention from individual and business data owners. With popularity of mobile devices, providing instant and reliable location-based services to smartphones and tablets has been a major means of delivering spatial data to real-world users. Therefore, ensuring spatial query integrity in database outsourcing paradigms is critical. In this paper, we proposedoi:10.1145/2424321.2424380 dblp:conf/gis/HuJKS12 fatcat:r4dn7ky4xnfufinabq3t4nzkui