This paper investigates urban traffic data by analysing the long-range correlation with detrended fluctuation analysis. Through a large number of real data collected by the travel time detection system in Beijing, the...This paper investigates urban traffic data by analysing the long-range correlation with detrended fluctuation analysis. Through a large number of real data collected by the travel time detection system in Beijing, the variation of flow in different time periods and intersections is studied. According to the long-range correlation in different time scales, it mainly discuss the effect of intersection location in road net, people activity customs and special traffic controls on urban traffic flow. As demonstrated by obtained results, the urban traffic flow represents three-phase characters similar to highway traffic. Moreover, compared by the two groups of data obtained before and after the special traffic restrictions （vehicles with special numbered plates only run in a special workday） enforcement, it indicates that the rules not only reduce the flow but also avoid irregular fluctuation.展开更多
For an urban planning perspective,industrial revolutions have always represented a disruptive moment in lives of cities.What will be the impacts of this fourth industrial revolution in the training of urban planners?T...For an urban planning perspective,industrial revolutions have always represented a disruptive moment in lives of cities.What will be the impacts of this fourth industrial revolution in the training of urban planners?This paper aims to investigate the contribution of Urban Big Data within the curricula of the Schools of Architecture.Adopting a qualitative and quantitative approach to analyze the syllabi of the schools of architecture,this work presents a first picture of the different approaches of this promising teaching subject,to foster a discussion on the different visions proposed to forge the next generation of town planner practitioners.展开更多
Based on the research on the diffusion of suspended sediments discharged outside of Yangtze River estuary and the landuse of Shanghai using Landsat MSS images in several years, the authors analysed the characteristics...Based on the research on the diffusion of suspended sediments discharged outside of Yangtze River estuary and the landuse of Shanghai using Landsat MSS images in several years, the authors analysed the characteristics of TM CCT data of Shanghai scene, pointed out concrete range of maximum turbidity and growth of urban boundary of Shanghai through the information extraction.The feature vector combination method is used in the research process. The result is getting nice.展开更多
燃气是人们生产和生活中不可或缺的要素,而燃气输配运行过程中燃气管网在燃气系统的设计、建设和维护中扮演着至关重要的角色。城镇燃气的高速发展,对燃气管网的运行管理提出了更高的要求,对精细化、科学化、规范化管理需求也不断提升...燃气是人们生产和生活中不可或缺的要素,而燃气输配运行过程中燃气管网在燃气系统的设计、建设和维护中扮演着至关重要的角色。城镇燃气的高速发展,对燃气管网的运行管理提出了更高的要求,对精细化、科学化、规范化管理需求也不断提升。为满足这些需求,地理信息系统(Geographic Information System,GIS)在城镇燃气地下管网中得到了广泛应用。运用空间数据转换处理系统FME(Feature Manipulate Engine)进行数据建库和数据转换,ArcMAP用于燃气管道设施空间数据处理,GeoPandas结合Sklearn程序包实现巡检网格制作及动态分析可实现地下燃气管道的精细化巡检,进一步提升输配管道设施的运行管理水平,降低事故发生,提高管网运行效率和安全性。展开更多
基金Project supported by the National High Technology Research and Development Program of China(Grant Nos.2008AA01Z208 and 2009AA01Z405)the Applied Basic Research Program of Sichuan Province of China(Grant No.2010JY0013)the Youth Foundation of Sichuan Province of China(Grant No.2009-28-419)
文摘This paper investigates urban traffic data by analysing the long-range correlation with detrended fluctuation analysis. Through a large number of real data collected by the travel time detection system in Beijing, the variation of flow in different time periods and intersections is studied. According to the long-range correlation in different time scales, it mainly discuss the effect of intersection location in road net, people activity customs and special traffic controls on urban traffic flow. As demonstrated by obtained results, the urban traffic flow represents three-phase characters similar to highway traffic. Moreover, compared by the two groups of data obtained before and after the special traffic restrictions （vehicles with special numbered plates only run in a special workday） enforcement, it indicates that the rules not only reduce the flow but also avoid irregular fluctuation.
文摘For an urban planning perspective,industrial revolutions have always represented a disruptive moment in lives of cities.What will be the impacts of this fourth industrial revolution in the training of urban planners?This paper aims to investigate the contribution of Urban Big Data within the curricula of the Schools of Architecture.Adopting a qualitative and quantitative approach to analyze the syllabi of the schools of architecture,this work presents a first picture of the different approaches of this promising teaching subject,to foster a discussion on the different visions proposed to forge the next generation of town planner practitioners.
文摘Based on the research on the diffusion of suspended sediments discharged outside of Yangtze River estuary and the landuse of Shanghai using Landsat MSS images in several years, the authors analysed the characteristics of TM CCT data of Shanghai scene, pointed out concrete range of maximum turbidity and growth of urban boundary of Shanghai through the information extraction.The feature vector combination method is used in the research process. The result is getting nice.
文摘燃气是人们生产和生活中不可或缺的要素,而燃气输配运行过程中燃气管网在燃气系统的设计、建设和维护中扮演着至关重要的角色。城镇燃气的高速发展,对燃气管网的运行管理提出了更高的要求,对精细化、科学化、规范化管理需求也不断提升。为满足这些需求,地理信息系统(Geographic Information System,GIS)在城镇燃气地下管网中得到了广泛应用。运用空间数据转换处理系统FME(Feature Manipulate Engine)进行数据建库和数据转换,ArcMAP用于燃气管道设施空间数据处理,GeoPandas结合Sklearn程序包实现巡检网格制作及动态分析可实现地下燃气管道的精细化巡检,进一步提升输配管道设施的运行管理水平,降低事故发生,提高管网运行效率和安全性。
