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Spatial alarm services are essential components of many location-based applications. One of the key technical challenges for supporting spatial alarms as a service is performance and scalability. This paper shows that the Euclidean distance-based spatial alarm processing techniques are inadequate for mobile users traveling on road networks due to the high overhead in terms of server load for alarm checks and the high energy consumption in terms of client wakeups. The authors design and develop ROADALARM, a road network aware spatial alarm processing service, with three unique features.
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