Measurement Method Of Collective Public Transport Space-time Accessibility Based On Smart Card Data

Accessibility is a comprehensive index commonly used in urban planning and transportation planning.Good accessibility can improve the travel quality of residents,promote urban development and ensure the stable development of urban transportation system.Under the background of promoting the development of public transport in cities,the study of public transport accessibility has great practical significance.The measurement of space-time accessibility can effectively and accurately reflect the space-time characteristics of individual travel.Among them,space-time prism is the basic framework to evaluate individual space-time accessibility.However,the space-time prism only gives the maximum reachable space-time boundary,and its internal travel attribute information lacks quantitative description.Although some studies have refined the representation of the internal characteristics of space-time prism through mathematical theory model,there is a gap between them and the actual spatial visit probability distribution.With the advent of the era of big data,it has practical reference significance to calculate the access distribution of spatial location by using massive and reliable smart card data.Based on the above,this paper proposes a method to calculate the visit probability of the public transport group in the internal space of the potential path area based on the smart card data.Combined with the land use data,this paper analyzes the access rules of the public transport group to different types of land in the potential path area,and then analyzes the travel rules of the public transport group according to the type of activities,The spatial and temporal accessibility of collective public transportation can be measured by this method.First of all,in the scale of traffic zones,combined with the travel characteristics of public transport group,the residence is identified by setting the space-time conditions based on the dwell time and the place of public transport group travel.Secondly,based on the traditional measurement algorithm of space-time prism,the measurement method of space-time prism for traffic zones and bus travel patterns is proposed.Thirdly,the activity anchor points of public transport groups are extracted,and the visit probability of bus station,traffic zones and land use block is calculated based on smart card data.Then,the collective accessibility measurement method based on land use data is proposed to obtain the activity type of the group.Taking Brisbane as an example,this paper measures the space-time accessibility of public transport for the elderly.The results show that this method has an empirical contribution to the spatial visit probability and activity type information of public transport group.