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Citizen sensor network
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Citizen sensor networks is an emerging paradigm in social computing research. It is defined as a network of interconnected participatory citizens who share their observations about various events and activities, in an almost real-time manner. The research in the area of citizen sensor networks focuses on analyzing and integrating citizen sensor messages by leveraging on the current research in the areas of text analytics, services computing, semantic Web, Web 2.0 and human computation. Citizen Sensor A citizen sensor is a human, who observes and reports on various events in a near real time manner using technologies such as Short message service and microblogging. When recording an observation, human sensing, perception, knowledge and intellect, which in most respect can be far more sophisticated than a machine sensor, is constantly applied. Citizen sensors capture and report their observations using devices such as smart phones. Aided by the Multimodal_interaction capabilities of these devices, observations can be in many forms such as a tagged photo or video, and/or a short text. Citizen Sensing Citizen sensing is an activity enabled by citizen sensors. A closely related activity to citizen sensing is mobile participatory sensing and people-centric sensing . Related Research A number of research issues are involved in developing advanced applications for which citizen sensors play a key role. These incude situational awareness, Spatio-temporal thematic processing, information retrieval and data mining, including analysis of casual text found in short messages such as microblogs and semantic sensor Web (especially for combining citizen sensors with machine sensors). Real world examples * In February 2008, Nokia and the University of California, Berkeley carried out an experiment where one hundred cars equipped with the GPS-enabled Nokia N95 were driven by students from Berkeley. The users traveled a 10-mile stretch of highway near San Francisco to show how real-time traffic information can be collected from the GPS feed. The experiment was carried out to test the traffic data collection and aggregation system. * A white paper from Mogility technologies discusses the usefulness of citizen sensors in the realm of public safety. 
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