Transport Equity Analysis For Employment Accessibility In Multimodal Public Transport Networks

Transport equity is an important part of China's balanced development.Improving transport equity is of great significance to building a fair society,promoting sustainable development,and building a harmonious society.Employment accessibility reflects the difficulty of urban residents to obtain employment opportunities,and is one of the most important benefits of urban transportation system.Combined with the multi-mode and multilevel development trend of China's urban public transport system,this paper takes the accessibility of multi-mode public transport as the basis of traffic equity evaluation,and explores the multi-level evaluation and analysis method of urban traffic equity.This paper takes Shenzhen as an example,a 500m*500m spatial grid as a research and research unit,combined with multi-source data to realize the extraction of permanent residents' occupation and residence,the classification of residents' income classes,and the Shenzhen multi-modal public transportation network for instance construction.The accessibility of public transport employment is analyzed and discussed from three levels: space,individual and income class.The main work and innovations are as follows:(1)Establish a multi-modal public transport network.The road network based on the Open Street Map(OSM)data and the public transport network based on the open data of Gaode are proposed respectively to build a multi-modal public transport network model,and a multimodal public transport network impedance calculation method combined with the multi-source data is proposed.(2)Employment accessibility model for refined spatial scale.Considering the complexity of urban multi-modal public transport network,a potential model based on time constraints is proposed to measure the accessibility of employment;according to the improved Dijkstra algorithm,the effective access path retrieval of multi-mode public transport network under time constraints is realized.(3)Multi-view transport equity evaluation method based on employment accessibility.From the perspective of space,I use spatial clustering as the analysis method to discuss the inequity level and characteristics of spatial distribution of employment accessibility through global autocorrelation and local autocorrelation;from the perspective of non space,I use Lorenz curve and Gini coefficient to measure the inequity degree and characteristics of urban employment accessibility distribution.