Impedance measures in evaluating accessibility change

Journal article, 2022

Earlier location-based accessibility analysis by car mode utilizes network travel distance (NTD) or static travel time (STT) as travel impedances. A recent trend in the literature that considers impedance as dynamic travel time (DTT) emerged, allowing examining continuous accessibility patterns. This research aims to evaluate the measured spatial-temporal change in accessibility for the different travel impedances. The research develops a GIS-remote sensing framework to evaluate the resemblance in spatial and temporal accessibility change at high resolution. It also investigates the dominant impact of significant accessibility components on influencing their results. According to results, impedances of NTD and STT represent almost identical outcomes, with correlation coefficients almost equal to 1.00, while failing to capture the dominant change of accessibility components. However, DTT illustrates varying patterns highly influenced by change in mobility. It shows the interplay between dominant accessibility components at the required resolution, which could facilitate better knowledge-based decisions for policymakers.