Abstract: Topological data model and entityoriented model are two kinds of traditional 3D vector data models. The topological model has certain difficulty in the expression of geographical entity of complex and its partial data local update. On the otherhand, entityoriented model has some shortcomings of complicated topological information processing and large data storage. Aimed at the advantages and disadvantages of these models, the authors design a new entityoriented 3D vector data model, which takes into the consideration of topological relations. This data model combines strongpoint of conventional topological data model and entityoriented model, which is able to meet the data model requirements in applications such as 3D landscape, TIN, and urban 3D geology.

Key words: 3D-GIS, 3D vector data model, topological relation, entityoriented