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To generate accurate real-time travel speed detection results for freeway traffic monitoring systems using GPS probe data, a Kalman filter based travel speed estimation algorithm is studied. According to the implementation with field GPS data from Los Angeles and the evaluation against speed measured by loop detectors as ground truth, correct rate of the computation speed is about 76%. The results...
Geographic information system (GIS) is a computer-based decision support system, which can manage, analyze and display spatial data in the environment of taking many factors as a whole. GIS has been widely applied in China's public health, serving in disease surveillance, epidemiology, environmental health research, research of health care utilization and decision making, respond to health emergencies...
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