摘要
提出了一种新的基于三维矢量图形、数字地面模型与数字地面正射影像相结合的数码城市空间数据模型 ,介绍了基于这一模型的软件平台原型———CCGIS ,并对未来数码城市构建技术进行了分析与展望。
With the development of computer technique and Internet,the concept of CyberSpace is formed.But different from our real world,the CyberSpace is structureless and chaotic,with no fixed topology,centers or boundaries.What can change the CyberSpace as our real world is the digital earth and city based on the 3D GIS and virtual reality technique.However,the 3D GIS spatial data model is not mature and difficult to be applied in practice,with less cooperation with the virtual reality.Thus,it is necessany to design a new spatial data model to meet the demand the application and visualization of digital city.In this paper,an Object_oriented 3D spatial data model for digital city is introduced.In this model,the 3D vector spatial data,digital elevation model and digital ground image data are integrated,which will provide more advantage for the visualization of digital city with virtual reality technique.As a new component of Geostar software,the CCGIS software is buidat on this spatial data model,and will be introduced,and how to issue the spatial data issue of a digital city.In Section 1,the lack of current 3D GIS model is pointed out,mainly is the more complex data model and huge data.The Visualization of digital city with VR is too difficult.The photogrammetry and remote sense provide us more digital ground images,This images can give us a overview of the city.With the digital elevation wich can be gained by photogrammetry,we can get the the airscape.This will fit the level of detail concept in the VR field.In Section 2,we introduces the objected_oriented spatial data model,which integrates the vector data,digital ground image and digital elevation model data.Section 3 introduces the CCGIS software,and the detail about how to organized the city's data with the software.Section 4 discusses the application of level of detail in the visualization of the city's scene,and the visnalizativn of the interior of 3D building.In the first filed,the digital ground image is directly looked as the first LOD level; The visualization o
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2001年第5期393-398,共6页
Geomatics and Information Science of Wuhan University
基金
国家杰出青年科学基金资助项目 ( 4 95 2 5 10 1)
