【作者】 吴泳锋；

【导师】 刘钊；

【作者基本信息】 清华大学 ， 大地测量学与测量工程， 2008， 硕士

【摘要】 黄河是我国水利的重要工作对象,本文以“数字黄河”的重要组成部分之一“黄河下游基于GIS的二维水沙数学模型”为基础。针对复杂的数学模型需要一个表现平台对其进行可视化的需求,重点研究了如何使各种水沙运动模型信息快速、直观、丰富地表现在GIS平台上。研究的主要模块包括流速场符号化、水文信息分类渲染、流速场动画、三维可视化等,主要涉及的技术内容包括.Net、GDI、ArcGIS开发、时态GIS、OpenGL等。论文首先通过对流速场数据的特点和符号化要求的分析,研究了ArcGIS Engine符号渲染接口及其与GDI结合的方法,分别实现了使用字符进行组合和使用GDI绘制两种方法进行单一值符号渲染。通过对两者的比较,得到了它们各自的特点和分别适用的场合。论文同时研究了ArcGIS的分类渲染功能,重点研究对其渲染方法进行控制的方法。通过.Net平台上的开发,不依赖第三方组件地实现了分级渲染这种在水利工程上运用最为广泛的功能及基于GUI的自定义功能,实现效果与专业的Desktop相关功能类似,为ArcGIS Engine的开发提供了扩展方法和案例。基于对动画效果实现的原理和技术的研究,论文在历史水文信息和GIS结合的基础上,通过对数据关系的处理和时间的控制,实现了GIS平台上可控、高效的二维动画效果,为基于GIS开发动画效果,便于为决策分析提供直观的信息提供了重要的实现方法和案例。论文基于对OpenGL的研究和实践,通过对正射影像图形的像素处理模拟叠加水沙运动信息的过程,实现了水沙运动模型的三维可视化,并探讨了在此基础上进行三维动画演示的可行性和技术路线,为实现实时、美观的三维可视化提供了技术方案和案例。最后,论文基于以上可视化模块的实现,通过实例数据的分析和测试,验证了上述模块对水沙运动模型信息可视化的作用和表现效果。更多还原

【Abstract】 The Yellow River is an important target of China’s water conservancy, As an important part of“Digital Yellow River”,“Two-dimensional Water and Sand Mathematical Model at Middle and Lower Reaches of the Yellow River Based on GIS”is the base of this thesis. The mathematical models need a performance platform for their visualization, this thesis focus on how to make a variety of hydrological information fast, intuitive, rich performance on GIS platform. The main modules, including symbols of the velocity field, hydrological information classification rendering, animation flow field, three-dimensional visualization, and other, mainly involving the technical content including .Net, GDI, ArcGIS development, temporal GIS, OpenGL, and so on.First of all, the thesis analyzed the velocity field of data through the characteristics and requirements of the symbols, researched symbols of the ArcGIS Engine interface and the method of combining GDI, respectively, it achieved the use of characters mix and GDI to renderer a unique value symbol. By comparison of the two, it obtained their respective characteristics.At the same time, it researched the classification of ArcGIS exaggerated features, its exaggerated emphasis on methods of control methods. Through the development on the .Net Platform, do not rely on third-party components achieved such a classification in rendering water conservancy project on the use of the most widely-based GUI functions and custom features, achieved professional results with the related features similar to Desktop and provides a expansion method of ArcGIS Engine development and case.Based on the realization of the principles of animation and technical research, through the time of treatment and control, this thesis achieved a GIS platform controllable and efficient two-dimensional animation based on the history of hydrological information and GIS integration. Based on GIS for the development of animation, it facilitate decision-making intuitive analysis of information and provided an important method and case.Based on OpenGL research and practice, through the image pixel graphics processing to the simulation stack of water and sediment movement, this thesis achieved the 3-D model visualization of the water and sediment movement, and discussed 3-D animation Demonstration of the feasibility and technology on the basis of this, it provided the technology and case to achieve real-time, the handsome three-dimensional visualization.Finally, the thesis based on the above visualization module, through examples of data analysis and testing, verified the role of water and sediment movement model information visualization and performance results.更多还原