Visualization Of Water And Sediment Movement Model Information Based On GIS

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.