Advanced Location-Based Technologies and Services

122 Advanced Location-Based Technologies and Services

networks and intermodal facilities on one hand. On the other hand, the optimal path-

nding approaches have been investigated in depth based on the multimodal network

data model.

To sum up, the transportation networks can be modeled as a set of mode graphs

according to their functional types, and the intermodal facilities, for example, park-

ing lots and public transit stations, can be modeled using the concept of switch point.

The discrete mode graphs can be plugged to each other by switch points in a exible

way in the process of path planning. The routing algorithms developed on the basis

of the data model are rooted in the traditional shortest path algorithms. They can

deal with the mul ...