Construction Of 3D Visualization Lane-based Road Network Model

In recent years, urbanization is increasing more rapidly, which results in a typical phenomenon that urban traffic network expands more rapidly and traffic jams is more frequent, and it becomes a hot topic for government and academic that how to use intelligent transportation system to solve the negative effects which caused by urbanization. One of the most important tasks is to build a road network model which can express the basic characteristics of road. Currently, the road network based on two-dimensional road centerline has generally existed, however, its geometry and topology expression can not meet the need of complex transportation system. The information of centerlines can not cover the changes of lanes, and the two-dimensional model is also inadequate in the expression of three-dimensional transportation networks. Therefore, this paper proposes a three-dimensional road data model based on lane. The model not only considers the generation rate, but also takes the three-dimensional expression of the basic characteristics of road network and the support to network analysis into account.The main content of this paper is three-dimensional modeling based on lane. And this paper's data source is two dimensional road centerline data and vehicle trajectory data of roads. The main idea includes the following sections:First, generate three dimensional centerlines from centerline data and elevation vehicle trajectory data. Secondly, construct the 3D road surface model based on buffer algorithm and lane properties. Finally, put the lane-based topology relationship integrated into the road network to support network analysis. This paper focuses on 3D road surface model generation and lane-based road network construction and its application. The involved and improved algorithms include Lagrange Interpolation Algorithm to interpolate elevations of some points, the Angle Bisector Algorithm to generate the road boundaries, and some technologies like Visibility Culling Algorithms and Levels of Detail, which are used to improve the displaying speed of model, and finally we propose Shortest Path Algorithm to carry out network analysis of three-dimensional road network mode.Based on the principle and algorithms, we use C#,DirectX and ArcGIS Engine as the development tools to build the three-dimensional road network model, which was employed in modeling Shanghai Expressway System, and we develop a basic demonstration platform which can display the spatial characteristics of the system in three-dimensional scenarios and also provide the basic spatial analysis, intuitive visual effects which can serve for mapping, planning and other departments.