Measuring Place-Based Accessibility Under Travel Time Uncertainty

Conventional place-based accessibility measures do not take into account travel time uncertainty and the time-varying effects of competition on the demand side. To fill this gap, we extend previous place-based accessibility measure, and propose a place-based space-time utility accessibility evaluation framework for urban area by considering travel time uncertainty and the time-varying effects of competition on the demand side. The accessibility of a location is conceptualized as the space-time utility offered by a set of accessible facilities from the location. To demonstrate the applicability of the proposed framework, a case study using large-scale taxi tracking data and the UGC data in Shenzhen is carried out to analyze the accessibility distribution to food services. The results of the case study indicate that the proposed accessibility measure can evaluate urban accessibility distribution more accurately than the traditional place-based accessibility measure.