Research On Spatial Accessibility Measurement And Layout Optimization Method Of Multimodal Public Transportation Network

The contradiction between the increasing of urban automobile ownership and the limited road resources causes serious urban traffic congestion.Urban builders focus on the public transportation with more intensive use of road resources and lower travel cost.The concept of"accessibility" is more suitable for the evaluation of the construction rationality and service level of public transport facilities.This paper explains the connotation of multi-mode public transport network,and analyzes the components and characteristics of it;expounds the connotation of accessibility and traditional measurement models,compares the advantages and disadvantages of traditional measurement models;defines the meaning of spatial accessibility of multi-mode public transport network,and analyzes multi-mode public transport network,with the influencing factors of spatial accessibility of public transport network analyzed.This paper analyzes the application of accessibility indicators in "spatial distribution equilibrium of public service facilities","regional housing price forecast" and "macro level travel evaluation".The paper introduces three indicators,namely "the shortest time to walk to the station","the number of stops arriving" and "the area of the accessible area of the bus stop",to describe the accessibility level of the bus stop;the spatial accessibility measurement model of multi-mode public transport network is established from three aspects of average travel time,weighted travel time and travel range,it also analyzes the impact of rail transit line by line on the spatial accessibility of public transport network.This paper expounds the connotation and method of layout optimization of multi-mode public transport network,analyzes the principles and influencing factors of layout optimization;this paper considers the accessibility index,and establishes a hierarchical optimization multi-mode public transport network layout optimization model.Based on MATLAB software,ant colony algorithm is used to solve the model;a certain area is selected as the research object,and the network accessibility index of the experimental area before and after optimization is analyzed,as well as the change of traditional public transport network evaluation index.