Intelligent traffic system(ITS) is a development trend for urban modern traffic.Active guidance control for urban traffic can relieve increasing traffic congestion pressure effectively.FCD(floating car data) based dyn...Intelligent traffic system(ITS) is a development trend for urban modern traffic.Active guidance control for urban traffic can relieve increasing traffic congestion pressure effectively.FCD(floating car data) based dynamic guidance for urban traffic is one of the directions of traffic control research.To meet the real-time demand for massive FCD processing,an FCD parallel computing based dynamic traffic guidance approach is presented and implemented.The FCD properties are analyzed in detail.An FCD parallel computing based dynamic traffic guidance system is developed on KD-50-I-E platform.Experimental results demonstrate the effectiveness and feasibility of the proposed approach.展开更多
概述
FCD是Floating Car Data的简称,意为“浮动车数据”,是一种交通流信息的来源。FCD交通流检测技术就是将汽车作为移动传感器,通过车上安装的GPS模块和通讯模块,定期向信息中心发送车辆位置、速度、时间或状态信息，通过对这些信息...概述
FCD是Floating Car Data的简称,意为“浮动车数据”,是一种交通流信息的来源。FCD交通流检测技术就是将汽车作为移动传感器,通过车上安装的GPS模块和通讯模块,定期向信息中心发送车辆位置、速度、时间或状态信息，通过对这些信息的分析和处理，获取交通流信息的一种技术。展开更多
文摘Intelligent traffic system(ITS) is a development trend for urban modern traffic.Active guidance control for urban traffic can relieve increasing traffic congestion pressure effectively.FCD(floating car data) based dynamic guidance for urban traffic is one of the directions of traffic control research.To meet the real-time demand for massive FCD processing,an FCD parallel computing based dynamic traffic guidance approach is presented and implemented.The FCD properties are analyzed in detail.An FCD parallel computing based dynamic traffic guidance system is developed on KD-50-I-E platform.Experimental results demonstrate the effectiveness and feasibility of the proposed approach.
文摘植被覆盖度是衡量地表植被状况的重要指标,在水文、气象和生态等方面的研究中具有重要作用。以Landsat8为数据源,采用Gram-Schmidt变换的光谱锐化融合方法提高热红外波段的空间分辨率,计算热量指数,对传统FCD模型(forest canopy density mapping model)进行改进,根据4种指数的关系计算植被覆盖度。通过与传统FCD模型方法计算结果比较,改进后的植被覆盖度计算方法具有更高的精度。
