The Conventional Public Transit Line Network Optimization Designing Based On POI Carrying Accessibility Index

With the development of social economy,the demand for urban public transportation is increasing day by day,and the contradiction between urban transportation supply and demand is more severe.The effective way to to improve the utilization rate of traffic resources and alleviate urban traffic congestion is to develop urban public transportation.Conventional urban public transport is an important part of public transport.At present,there are many problems in operation and management,infrastructure,network layout and so on.An important factor restricting the healthy development of conventional public transport is the unreasonable layout of the line network.Optimizing the bus network is of great significance to enhance the operational efficiency and attractiveness of conventional buses.Traffic Basic Data is the Key and Foundation of Optimum Design of Traffic Line Network.In this thesis,the following four aspects are studied to optimize the design of routine bus network:Firstly,the technology of POI acquisition and processing is analyzed.Two models of FME grid coordinate extraction and ArcGIS partition derivation are constructed,and the calculation method of equivalent POI is determined.Secondly,the POI carrying accessibility index is constructed,Starting from the accessibility matrix.the bus accessibility of traffic zones is analyzed based on the POI carrying accessibility index.Then,the principle of optimum design of line network is put forward,and the optimal design model of line network is established,which takes the minimum equivalent of non-reachable suitable area,the maximum POI coverage density of public transport network and the minimum transfer rate of line network as the optimization objectives,and takes POI carrying accessibility index,line length and non-linear coefficient as constraints.An improved genetic algorithm is designed to solve the model.Finally,the POI data of the urban area of Xupu County are collected and analyzed,taking the bus system of the urban area of Xupu County as an example.The optimal layout of the urban public transport network in Xupu County is obtained,and the correctness of the optimization model of the public transport network constructed in this thesis is verified by solving the optimization model of the network.This thesis regards POI data as the basis of routine bus network optimization design,which is a new idea of network optimization design.The POI carrying accessibility index is used to analyze the accessibility of traffic zones and the optimal design model of network is constructed.This enriches the theory of routine bus network optimization,provides relevant basis for the relevant departments'decision-making of network optimization,and has good practicability and innovation.