Public Transit Network Model And Transfer

With the growth of the number of motor vehicles, road traffic increases rapidly, which causes serious traffic congestion and makes people's travel more difficult than before. In order to alleviate the problem, many cities make efforts to advocate public transportation. From the viewpoint of Intelligent Transportation System, developing public transportation not only means to build more bus lines, but to make efforts to improve the existing level of service lines. One important factor is the transfer problem between different bus lines. Geographic Information System is a science with strong information management and spatial analysis capabilities, which is suited for offering technical support for public transport planning and management. This paper is concerned with transit network and transfer issue on transit network.This paper mainly contains two parts:First, how to build transit network model which is composed with bus stops and bus lines. Second, how to transfer on the built transit network model. The main idea includes the following sections:First, analyze the features of the transit network which is different from the traditional network with geometry. Second, represent the transport network elements in GIS including bus lines and bus stops. Bus stops are denoted as nodes in a network. Bus stops which are close to each other and share the same name are merged as a single node. Connecting the two adjacent nodes at the direction of bus lines, then the basic unit of the public transport network is created, which is named bus arcs. The arcs and stops need to be digitized. And only record the attributes of bus lines. Build E-R model of stops, arcs and lines to represent their relationship. Third, design a transfer algorithm which guarantees minimum transfer times. Part of the bus lines and stops in Shanghai are chosen to test the transit network model and the transfer algorithm.How to construct the transit network model is the key issue this paper concerns.