Aggregation and Amalgamation in Land-use Data Generalization

The land-use map is a typical kind of categorical theme and has the properties covering the whole area with neither gap nor overlapping area.Its generalization has to consider geometric simplification,semantic hierarchy abstraction and statistical properties maintenance.This paper focuses on the combination of neighbor parcels giving two operations:aggregation and amalgamation.The previous aims at the polygon objects with homogeneous semantics,and the latter aims at those with heterogeneous semantics.The decision of neighborhood relationship is the basis of two operations.This study considers both spatial and semantic facts in the judgment of neighborhood cognition based on Voronoi diagram model.The work flow of two operations is presented in land-use data generatization with the experiment result of real data.