摘要
提出了采用特征数据进行VRML建模的方法解决WebGIS的瓶颈问题———巨大的空间数据与有限的网络带宽之间的矛盾。
This paper introduces a new way of modeling using feature data in VRML to solve the key problem which is the conflict between the huge spatial data and limited net bandwith. VRML is the tool for creating three_dimensional virtual experience on the world wide web.VRML is designed as a common file format to allow anyone browsing the web to view threedimensional.It is written in plain text and hence can be created using a simple text editor.Using VRML in Web GIS has been developed in many commercial GIS software.The modeling technology based on feature data was generated in 1980s and developed very quickly. The feature data of the geometry and place information of three_dimensional scene are used in it. A structure of VR_Web GIS based on feature data modeling is provided.This paper details in how to realized the system. In the system the method of feature data modeling is used in two fields:① reduce the point of DEM to lessen the data of DEM;② predigest the object model of the three_dimensional scene. Lastly,two algorithms are discussed.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2002年第5期538-542,共5页
Geomatics and Information Science of Wuhan University
基金
湖北省自然科学基金资助项目 (99J171)。
