摘要
D GISs were developed simultaneously in the late 1980s in a number of different disciplines.The development of these 3D GISs can not yet meet all needs for new representations and analytical tools in 3D environments.In this paper,the data structures,especially solid_based data representations are introduced.Then,a typical object_oriented data model is put forth to show a new data model.And at last,two data access methods are proposed to make the data model clear.
3D GISs were developed simultaneously in the late 1980s in a number of different disciplines.The development of these 3D GISs can not yet meet all needs for new representations and analytical tool s in 3D envir onments.In this paper,the data structures,especially solid-based data representa tions are introduced.Then,a typical object-oriented data model is put forth to s how a new data model.And at last,two data access methods are proposed to make th e data model clear.
基金
theDoctoralFoundationofEducationMinistryofChina(No.960 4 980 2 )
