Space-time prism(STP)is a fundamental concept in time geography and has been predominately constructed in unimodal transportation networks.Due to the vast trip chaining options by private vehicles and public transport...Space-time prism(STP)is a fundamental concept in time geography and has been predominately constructed in unimodal transportation networks.Due to the vast trip chaining options by private vehicles and public transportation,it was challenging to construct STP over multimodal transportation networks.We previously put forward an efficient method to narrow down the action space for trip chaining and construct STPs effectively in a multimodal supernetwork.This study applies multimodal STP modeling to measure space-time accessibility and equality of daily activity opportunities.Two equality measures(Gini coefficient and 20:20 ratio)are derived from two space-time accessibility measures based on delineated STPs.We examine the equality of access to shopping and leisure opportunities in the Rotterdam-The Hague metropolitan area,the Netherlands.The results show the effects of various factors on accessibility and equality.It is found that although the study area has relatively low inequality using single modes,multimodal trip chaining further reduces inequality to access the distributed space-time opportunities.展开更多
Space-time prism(STP)modeling offers a theoretical base for various person-based space-time accessibility measures.It has been challenging to construct STPs in multimodal transportation networks because of the vast mu...Space-time prism(STP)modeling offers a theoretical base for various person-based space-time accessibility measures.It has been challenging to construct STPs in multimodal transportation networks because of the vast multimodal trip chaining options between private vehicles and public transportation.This study suggests an effective method for narrowing down the trip chaining space.The method involves three incremental strategies to eliminate parking locations that contribute little to enlarging the STP.First,an upper bound potential path area(PPA)is constructed to remove all inferior parking locations.Second,the study area is partitioned and only complementary parking locations attractive to trip chaining are selected.Third,triangular inequalities are applied for pruning.The selected parking locations are used to construct a compact multimodal supernetwork encompassing one episode of activity participation.Consequently,the STP and PPA can be found by an existing twostage bidirectional search method.Experimental tests are conducted to demonstrate the effectiveness of the method.It is found that 1-2 orders of speedups can be achieved with little compromising the accuracy of measuring space-time accessibility.The suggested method is applicable for measuring space-time accessibility in large-scale multimodal transportation networks.展开更多
基金supported by the Dutch Research Council(NWO no.438-18-401).
文摘Space-time prism(STP)is a fundamental concept in time geography and has been predominately constructed in unimodal transportation networks.Due to the vast trip chaining options by private vehicles and public transportation,it was challenging to construct STP over multimodal transportation networks.We previously put forward an efficient method to narrow down the action space for trip chaining and construct STPs effectively in a multimodal supernetwork.This study applies multimodal STP modeling to measure space-time accessibility and equality of daily activity opportunities.Two equality measures(Gini coefficient and 20:20 ratio)are derived from two space-time accessibility measures based on delineated STPs.We examine the equality of access to shopping and leisure opportunities in the Rotterdam-The Hague metropolitan area,the Netherlands.The results show the effects of various factors on accessibility and equality.It is found that although the study area has relatively low inequality using single modes,multimodal trip chaining further reduces inequality to access the distributed space-time opportunities.
基金supported by the Sino-EU joint research project(NSFC no.71961137001,NWO no.438-18-401).
文摘Space-time prism(STP)modeling offers a theoretical base for various person-based space-time accessibility measures.It has been challenging to construct STPs in multimodal transportation networks because of the vast multimodal trip chaining options between private vehicles and public transportation.This study suggests an effective method for narrowing down the trip chaining space.The method involves three incremental strategies to eliminate parking locations that contribute little to enlarging the STP.First,an upper bound potential path area(PPA)is constructed to remove all inferior parking locations.Second,the study area is partitioned and only complementary parking locations attractive to trip chaining are selected.Third,triangular inequalities are applied for pruning.The selected parking locations are used to construct a compact multimodal supernetwork encompassing one episode of activity participation.Consequently,the STP and PPA can be found by an existing twostage bidirectional search method.Experimental tests are conducted to demonstrate the effectiveness of the method.It is found that 1-2 orders of speedups can be achieved with little compromising the accuracy of measuring space-time accessibility.The suggested method is applicable for measuring space-time accessibility in large-scale multimodal transportation networks.
