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The Conceptual Schema of Map Generalization from Spatial Mapping Perspective

AI Tinghua(Laboratory of Digital Mapping and Land Information Application Engineering, Wuhan University,Wuhan 430079,China)  
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 11, n1, nm 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 isodistancerelationship 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.
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