毕业论文x.docx

摘要
随着计算机图形技术、多媒体技术、空间技术、以及可视化技术等的飞速发展,地理信息系统正经历着由二维向三维转变的一个过程,三维地理信息系统(简称 3DGIS)也已经成为目前 GIS 领域发展的趋势之一,三维 GIS 的应用非常广泛且具有重要意义。但迄今为止,三维 GIS 的研究与实践仍面临许多问题,因而很有必要对其进行研究。
本文在分析和研究三维地形可视化的研究现状、研究背景和意义及三维地形可视化相关技术的基础上,提出了以 Visual C#.NET 为开发环境平台,以 ArcEngine 为二次开发组件的三维地形可视化系统的总体设计,详述了系统三维地形可视化功能和三维地形分析功能的实现方法和关键技术,设计并实现了包括三维地表生成模块、三维场景浏览及设置模块、三维地形分析模块的三维地形可视化系统。三维地表生成模块实现了生成三维地形表面的功能,包括 TIN 数据和 Raster 数据,用于生成三维场景,是三维场景浏览及设置模块和三维地形分析模块中各功能操作的主要数据基础。三维场景浏览及设置模块实现了放大、缩小、漫游、三维属性查询等场景浏览功能和场景参数、叠加纹理、分层设色等场景设置功能。三维地形分析功能模块实现了包括曲率分析、坡度分析、剖面分析、水淹分析、等值线生成等地形分析功能,是系统研究的重要部分。
关键词:三维地形可视化;地理信息系统;数字高程模型;ArcEngine;地形分析
Abstract
With the development of visualization and virtual reality technology, it es possible to establish 3D real-time, interactive artificial terrain environment. At present, realizing the terrain analysis in the 3D terrain environment and expressing real terrain more accurate and intuitively in visual condition e the focus of studying.
Based on the current research situation of 3D terrain visualization, background and significance and the relevant technology of 3D terrain visualization, this thesis has proposed the overall design of the 3D terrain visualization system regarding Visual C#.NET platform as the development environment and ArcEngine as secondary development package. It detailed the implementation method and key technology of the visual and analyzing -function of 3D terrain visualization system. And it has designed and realized 3D terrain visualization system including the 3D surface generation module, 3D scene browsing and setting module and 3D terrain analysis module. 3D surface generation module implements the 3D terrain surface data, including TIN and Raster, and the data that would be used to generate 3D scene is the main basic data for 3D scene browsing and setting module and 3D terrain analysis module to performing their functions. 3D scene browsing and setting module has implemented the function of browsing 3D scene, including enlarging, narrow