节点文献
面向对象三维GIS及可视化研究
Research on Object-Oriented Three-Dimensional GIS and Visualization
【作者】 王兵；
【导师】 王亚民；
【作者基本信息】 西安电子科技大学 ， 情报学， 2009， 硕士
【摘要】 三维地理信息系统是数字城市的核心技术之一。目前,在城市规划方面主要采用二维GIS来进行平面设计和应用,但是现实世界是真实的三维空间,故不能较好的显示真实世界。面向对象三维GIS数据模型及可视化技术处理的是三维空间,能够获得更真实的感受,现已成为当前研究的重要课题。本文对三维GIS面向对象数据模型及其可视化技术两个方面进行了深入研究。在数据管理方面,由于现有的空间数据模型采用了基于域或对象的数据模型,但不能满足属性数据和空间数据同时管理要求,我们结合面向对象技术提出了一种适用于“数字城市”的面向对象三维数据模型,该模型实现多种三维矢量模型数据的一体化存储管理。最后,我们还设计了三维GIS数据管理平台3DGIS-SDE。在可视化方面,本文基于该面向对象数据模型,运用层次细节技术(LOD)和多分辨率纹理模型等关键技术解决了三维GIS的可视化问题,加快三维场景的渲染速度;通过人机交互的方式控制场景的三维绘制,实现了三维场景中漫游,改善了三维景观可视化效果;同时,利用层次包围盒技术解决了在三维场景漫游过程中的碰撞检测问题,以增强三维景观的真实性,以更加逼真的方式显示三维空间。最后,对三维GIS系统的信息查询过程进行分析,并讨论了光照计算空间分析算法,实现了一个功能较强的三维数字地理信息查询与分析系统(3DGIS)。
【Abstract】 The three-dimensional GIS is one of key technology of the digital city. Currently, most applications use two-dimension GIS to design, but reality is a real three-demension space, so can not display reality. Object-oriented three-dimensional GIS data model and visualization process for three-dimensional space, and get more reality taste, become now an important research subject. In this paper, three-dimensional GIS data model and visualization technology will be researched.In the aspect of data management, due to Spatial data models exist can not meet the need of management for spatial data and attribute data together. We provide a new object-oriented data model which is apt to "digital city" based on object-oriented technology. This model implements the store management for multi-demensional vector data. Final, we design a 3DGIS-SDE platform for three-dimensional GIS.In the aspect of visualization, based on the model and key technology such as LOD and multi-scale model, this paper solves the problem of visualization for three-dimensional GIS, which accelerates the speed of drawing scene and enhances the effect of visualization and reality. At the same time, with the technology of level encircle, this paper solves the problem of colliding in the three-dimensional scene, and displays the real three-dimensional space.Finally, the query process of three-dimensional GIS system is analyzed, and light illumination arithmetic for spatial analysis is discussed. A three-dimensional GIS query and analysis system (3DGIS) is designed and implemented with completely function.