单纯以交通(车速)为导向的城市道路分类容易割裂道路与城市的有机联系,难以满足城市发展的需求。城市道路承载着商业、休憩、景观、居住等多项城市基本功能,其划分应该将城市功能空间考虑其中。文章以南宁市中心为例,运用交通链路-空间...单纯以交通(车速)为导向的城市道路分类容易割裂道路与城市的有机联系,难以满足城市发展的需求。城市道路承载着商业、休憩、景观、居住等多项城市基本功能,其划分应该将城市功能空间考虑其中。文章以南宁市中心为例,运用交通链路-空间理论,基于13个类型的POI (point of interest)兴趣点数据,利用地理信息系统(GIS)的缓冲、相交、叠加、计算等功能,以道路等级和城市空间等级为指标对道路进行二维分类,构建更加合理全面的道路分类过程与方法,使道路与城市更加紧密联系起来。展开更多
Air route network is the carrier of air traffic flow,and traffic assignment is a method to verify the rationality of air route network structure.Therefore,air route network generation based on traffic assignment has b...Air route network is the carrier of air traffic flow,and traffic assignment is a method to verify the rationality of air route network structure.Therefore,air route network generation based on traffic assignment has been becoming the research focus of airspace programming technology.Based on link prediction technology and optimization theory,a bi-level programming model is established in the paper.The model includes an upper level of air route network generation model and a lower level of traffic assignment model.The air route network structure generation incorporates network topology generation algorithm based on link prediction technology and optimal path search algorithm based on preference,and the traffic assignment adopts NSGA-Ⅲalgorithm.Based on the Python platform NetworkX complex network analysis library,a network of 57 airports,383 nodes,and 635 segments within China Airspace Beijing and Shanghai Flight Information Regions and 187975 sorties of traffic are used to simulate the bilevel model.Compared with the existing air route network,the proposed air route network can decrease the cost by 50.624%,lower the flight conflict coefficient by 33.564%,and reduce dynamic non-linear coefficient by 7.830%.展开更多
文摘单纯以交通(车速)为导向的城市道路分类容易割裂道路与城市的有机联系,难以满足城市发展的需求。城市道路承载着商业、休憩、景观、居住等多项城市基本功能,其划分应该将城市功能空间考虑其中。文章以南宁市中心为例,运用交通链路-空间理论,基于13个类型的POI (point of interest)兴趣点数据,利用地理信息系统(GIS)的缓冲、相交、叠加、计算等功能,以道路等级和城市空间等级为指标对道路进行二维分类,构建更加合理全面的道路分类过程与方法,使道路与城市更加紧密联系起来。
文摘Air route network is the carrier of air traffic flow,and traffic assignment is a method to verify the rationality of air route network structure.Therefore,air route network generation based on traffic assignment has been becoming the research focus of airspace programming technology.Based on link prediction technology and optimization theory,a bi-level programming model is established in the paper.The model includes an upper level of air route network generation model and a lower level of traffic assignment model.The air route network structure generation incorporates network topology generation algorithm based on link prediction technology and optimal path search algorithm based on preference,and the traffic assignment adopts NSGA-Ⅲalgorithm.Based on the Python platform NetworkX complex network analysis library,a network of 57 airports,383 nodes,and 635 segments within China Airspace Beijing and Shanghai Flight Information Regions and 187975 sorties of traffic are used to simulate the bilevel model.Compared with the existing air route network,the proposed air route network can decrease the cost by 50.624%,lower the flight conflict coefficient by 33.564%,and reduce dynamic non-linear coefficient by 7.830%.
