三维动态交互式可视化模型─-地理信息系统中的三维表示与分析

3D Dynamic Interactive Visualization Model──Three Dimensional Representation and Analysis for GIS

针对当前计算机图形技术的发展和GIS多专业应用需求的特点，本文以吉奥之星（Geostar）地理信息系统平台为例，研究了在当前二维系统中如何考虑三维或者2．5维表面表示与分析的问题。提出了集成数字高程模型（DEM）、数字正射影像、常规的矢量数据和各种属性信息在一起，建立一体化的三维数据输入、操作与可视化机制，并在此基础上提出了二维与三维混合表示的空间查询与分析模型。该模型扩展了可视化概念，将可视化技术贯穿于整个GIS运行过程。

The problem of how to deal with the three dimensional representation and analysisof terrain surface within the two dimensional GIS, such as GeoStar,is examined in this paper. It is stressed that the concept of visualization is expanded into the whole GIS system. it'smuch more than visualization,i. e. it enables the data-input more flexible,data interpolationmore powerful,model viewing and manipulation capabilities more highly interactive. The author proposes integrating DEM and digital orthographic image with the basic data of 2D GISto provide 3D realistic environment for geo-referenced multidiscipline applications.