111方程段1部分1摘要道路工程网络三维可视化技术是实现道路工程领域信息化、可视化的一项重要内容，在道路工程的应用可以贯穿设计、建设及运营的全生命周期，具有重要的研究意义。本文综合应用了道路路线设计、计算机网络技术、计算机图形学、网络地理信息系统等理论和方法，针对道路工程网络三维可视化中道路三维模型构建、网络框架总体设计、海量三维模型数据的调度与快速传输以及与网络地理信息系统的集成等难点问题进行了深入的研究。主要研究内容和成果如下：(1)在分析和对比几种常用的计算机网络模型及体系结构的基础上，设计了适用于道路工程网络三维可视化需求的基于HTTP协议的B/S模式三层网络框架。(2)采用几何三维模型构建技术，快速高效地实现了组成道路三维场景各要素模型的构建，为道路工程网络三维可视化提供了模型基础。(3)提出并实现了一种面向海量模型数据网络快速传输的多分辨率简化算法，在服务器端将原始三维模型分解为最粗糙模型和一系列细节层次记录，并且最粗糙模型在客户端具有自动恢复到原始模型的能力。结合离散化处理、数据缓存、数据压缩等技术进一步提高了海量模型数据的传输速度。(4)研究了基于较高性能GPU的客户端三维模型快速绘制方法，运用显示列表、VBO等技术提高了复杂道路三维场景在客户端绘制效率，分析讨论了GPU可编程技术在道路工程网络三维可视化中的应用前景。(5)提出了一种基于MapXtreme和Ajax技术的道路工程网络地理信息系统构建方法，重点研究了道路工程网络三维可视化系统与之集成和通信的机制，并实现了在B/S模式的客户端三维交互式场景和二维电子地图中，针对道路设计和建设信息的远程快速查询。(6)综合运用以上所述方法和技术，在导师的指导和其他同学的协助下，采用J2EE、Jogl等开发工具，结合Web3D与WebGIS技术开发了基于B/S架构的高速公路建设信息可视化查询平台，并将该平台应用于高速公路建设管理中，实践证明了本文所述关于道路三维网络可视化的理论和方法的正确性。关键词：道路，三维网络可视化，模型简化与调度，Jogl，WebGIS目录第一章绪论······································································································61.1引言············································································································61.2研究目的及意义·····························································································71.3国内外研究现状·····························································································71.3.1道路三维建模·························································································································71.3.2道路模型视相关简化·············································································································81.3.3网络框架总体设计·················································································································91.3.4客户端渲染引擎························...
