【作者】 明安发；

【导师】 王子牛；

【作者基本信息】 贵州大学 ， 计算机应用技术， 2006， 硕士

【摘要】 三维地形可视化是近年来计算机图形学和地理信息系统相结合而产生的一个新的研究热点。利用地理信息系统所采集的地形数据资料，通过地形建模，纹理映射，光照模型设定，投影模式选择以及地形漫游等，可实现具有高度真实感的三维地形动态显示，目前该技术己在战场环境仿真、娱乐与3D游戏、地形漫游、道路选线、土地规划、地理信息系统等诸多领域得到了广泛的应用。 本文在查阅相关文献资料的基础上对三维地形地貌的快速、真实的生成方法进行了研究，主要是利用DEM生成正方形地形网格。在此基础上，提出利用小波分析方法对数字高程模型(DEM)数据进行多分辨率处理，简化地形模型，并以此来降低计算机的处理数据量，达到快速的场景生成。其中数字高程模型的小波地形简化是本文研究的重点。 最后作者以本论文的理论研究成果为基础并结合相关课题，利用VC++开发环境初步研究开发了一套基于OpenGL的三维可视化漫游系统。此系统具有数据导入导出、三维模型的计算机重构显示、数字高程模型的简化及纹理贴图、设置路径模拟飞行等功能，使用户可以多角度多侧面地了解地形地貌。更多还原

【Abstract】 3D-Visualization is a new hot research topic and combined Computer Graphics with Geographical Information System in recent years. Its main idea is application of the geology data that the geography information system collects, by setting up the mold through a geography, the texture reflecting to shoot, the light shining on the model enactment, choice of projection model and terrain cruising function, the dynamic manifestation of terrain with high 3D can be carried out. That technique is abroad used in battlefield environment simulation, entertainment and 3D game, cruise in terrain scene, road choosing, soil plan, WebGIS.This paper makes the survey to visualization technology quickly and really of three-dimensional terrain model on the basis of consulting relevant documents. It is mainly to create square grid of terrain surface by using digital elevation model. On the condition, it also proposed a model of processing digital elevation model data multiresolutionally with the methods of wavelet. All these, the result will realize the purpose of increasing the scene frame rate. In the paper focal point put the model simplification with wavelet transform.Finally based on the theoretic research accomplishment of this paper combined related program, the author developed a 3D cruise system using OpenGL technology in Visual C++ development environment. Functions of this system are as follows: data import and reconstruction, digital elevation model simplification export, 3D digital model and texture paste, fly route display setting flight simulation. And user can understand the terrain from many aspects by cruising function and projection.更多还原