GIS线目标间拓扑关系描述的4交差模型

提出了利用连通度不变量来区分单个线目标上具有不同拓扑特性的点,进一步定义了线目标的端点集和内点集。在此基础上,建立了IR1和IR2中线目标间拓扑关系的基本模型。该模型能有效地表达线目标间拓扑关系的变化特性。||The concept of connective degree is utilized for the identification of topological difference in the geometric structure of a line,its generally topological definition of a line is given.A generic model,called the 4-intersection-and-difference,is set up for the description of basic line-line topological relations,upon which a conceptual neighborhood graph is built with the consideration of topological distance.It concludes that the proposed model in this paper can represent the property of topological changes,and basic relations between line segments in IR~1 and IR~2.