三维GIS大数据量场景快速可视化关键技术研究

发布时间：2018-03-12 10:42

本文选题：三维GIS　切入点：大数据量场景　出处：《浙江大学》2013年硕士论文　论文类型：学位论文

【摘要】：大数据量场景的快速可视化一直是三维GIS领域的热点研究问题,三维GIS中涉及到大量的地形、影像、纹理等数据,在目前的软硬件环境下,实现大数据量的实时可视化是十分困难的。在三维GIS可视化研究中,LOD这一思想成为了必不可少的技术和方法。过去,地形场景简化技术都是以CPU为核心的,其缺陷是为了进行加速所进行处理的额外开销甚至会超过由于减少绘制的网格数目所带来的时间补偿。随着GPU技术的飞速发展,人们开始寻找一种能够充分利用GPU的地形可视化策略。本文在前人研究的基础上,通过对LOD模型简化技术和GPU技术的研究,提出一种基于GPU的LOD模型简化渲染策略。本文主要完成了以下几个方面的工作： (1)采用多级四叉树的方式来进行数据组织,既具有分块地形更新灵活的特点,又具有多分辨率LOD地形模型的多LOD因子控制的特点。 (2)对于LOD评价因子,综合考虑节点静态因素和节点到屏幕距离以及节点大小、摄像机移动速度这几个LOD评价因子,构造出LOD节点评价函数。 (3)结合OpenGL、GPU、GDAL等技术,使用C++语言,基于Qt开发平台,实现了三维GIS快速可视化系统的开发。
[Abstract]:Fast visualization of large amount of data scene has always been a hot topic in the field of 3D GIS. 3D GIS involves a large number of terrain, image, texture and other data, in the current software and hardware environment, It is very difficult to realize the real-time visualization of large amount of data, and the idea of LOD has become an indispensable technique and method in the research of 3D GIS visualization. In the past, terrain scene simplification technology was based on CPU, and its disadvantage was that the extra cost of processing in order to speed up the processing would exceed the time compensation caused by reducing the number of meshes drawn. With the rapid development of GPU technology, People began to look for a terrain visualization strategy that could take full advantage of GPU. On the basis of previous studies, this paper proposes a simplified rendering strategy of LOD model based on GPU through the research of LOD model simplification and GPU technology. The main work of this paper is as follows:. 1) multilevel quadtree is used to organize the data, which is not only flexible in the updating of block terrain, but also has the characteristics of multi-#en1# factor control of multi-resolution LOD terrain model. 2) for the LOD evaluation factor, considering the static factors of the node, the distance from the node to the screen, the node size and the camera moving speed, the evaluation function of the LOD node is constructed. In combination with OpenGL GPU GDAL and C language and QT development platform, the rapid visualization system of 3D GIS is developed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208

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