Spatial Relation Abstract in Map Generalization Process

From the point of view of mapping transformation, this paper presents a map generalization concept framework which regards generalization as two kinds of mapping procedures: spatial entity mapping and spatial relation mapping. According to the number change of participating entity, spatial entity mapping is classified as 1-1, n-1, n-n mapping. And spatial relation mapping is described as a composite relation transformation of topological, distance and orientation relation. The concept spatial relation resolution is introduced to describe spatial relation related constraints. Based on 9 intersection model, cardinal direction model and iso-distancerelation model, the paper gives three sorts of relation resolution representation for topologicl, orientation and distance relation respectively. The behavior of two mapping in map generalization is discussed and spatial relation abstract obtains emphasis compared with traditional generalization concept model.