摘要
基于关系代数的映射变换思想,将地图综合的概念框架划分为2种映射形式:空间实体映射和空间关系映射,根据变换前后空间实体数目的变化,空间实体映射进一步区分为1 1,n 1,n m映射。空间关系映射则视为拓扑关系、距离关系、方向关系3种基本关系的复合变换。为描述综合过程中粗化表达,建立了"空间关系分辨率"概念,基于9交叉、主方向模型以及本文自行建立的"等距离关系"模型分别给出了拓扑关系、方向关系、距离关系中分辨率的表达方式。在概念级上讨论了2种映射在地图综合过程的表现形式,这一综合模式与传统方法的显著区别是,它强调了关系也存在综合的问题。
From the point of view of mapping transformation, this paper presents a map generalization conceptual framework which regards generalization as two kinds of mapping procedures: spatial entity mapping and spatial relationship mapping. According to the number of changes in the participating entities, spatial entity mapping is classified as 11, n1, nm mapping. Spatial relationship mapping is described as a composite relationship transformation of the components: topology, distance and orientation. The concept 'spatial relationship resolution' is introduced to describe spatial relationship related constraints. Based on the 9 intersection model, the cardinal direction model and the isodistancerelationship model, the paper gives three sorts of relationship resolution representations for topological, distance and orientation relationship respectively. The behavior of the two mappings in map generalization is discussed and a special emphasis on the spatial relationship abstraction is placed compared with the traditional generalization conceptual model.
出处
《测绘学报》
EI
CSCD
北大核心
2003年第1期87-92,共6页
Acta Geodaetica et Cartographica Sinica
基金
自然科学基金资助项目(40101023)
