Logsum-type space-time accessibility measures (STAMs) that can be calibrated under a definite time budget

Abstract

ABSTRACT The ease of access to sites for activities is referred to as ‘accessibility,’ and the degree of accessibility is inherently the outcome of land use patterns and transportation networks. Therefore, accessibility measures (AMs) are required to evaluate and plan for land use and transportation. Geographic information system tools greatly aid in the calculation of AMs. Since the inception of time geography, an individual’s time constraint has been acknowledged as one of the most important dimensions of accessibility. Thus, the development of theoretically reasonable and practical space-time accessibility measures (STAMs) is a relevant theme in GIScience. By employing a logit modeling framework, this study formulated logsum-type STAMs that have theoretical and practical advantages over existing STAMs. In terms of theoretical plausibility, the proposed STAMs have a behavioral theoretical foundation and satisfy the axioms of AM. In terms of practicality, the proposed STAMs can easily be calibrated with respect to a certain definite time budget. Based on a case study, we demonstrate how the proposed STAMs can be used in practice, with an emphasis on parameter estimation, and we present empirical results that illustrate the plausibility of these STAMs.