Connectivity Evaluation Method for Integrated Three-Dimensional Transportation Networks

The focus of intercity transportation research has shifted to integrated three-dimensional transport networks made up of many modes of transportation, including road, rail, and air. This study establishes a topological model of integrated three-dimensional transportation network for various components of the transportation infrastructure of an integrated three-dimensional transportation network to evaluate the connectivity of the transportation network thoroughly on the basis of existing single-mode transportation network connectivity indicators. It also creates an evaluation index system characterizing network connectivity from a static perspective. The integrated three-dimensional transport network’s connectivity is assessed at four different levels—node, transport hub, region, and network—and is verified using arithmetic examples. The approach suggested in this study can offer extensive scientific and intuitive decision-making support for the future development of multimodal transport infrastructure.