专题地图自动成图方法探讨

The Realization of Automatic Thematic Mapping

专题地图是用于强调表示特定要素或概念的地图。每幅专题地图都由两个主要的要素组成:地理底图和专题要素。对于专题数据,采用数学方法和统计方法进行预处理,根据用户要求和知识库的参与,确定相应的数学模型,在此基础上,联接相应的专题符号库,实现专题迭加。因此,专题地图的自动制图实现,是在数据库,模型库,符号库的相互制约下,通过它们之间的接口,在知识库的干预下实现的。

Thematic map emphasizes on the given map elements or concepts.Every thematic map is consisted of the geographic map and the thematic overlay.In order to realize the automatic thematic mapping,firstly the geographic database and the thematic database must be built.For the geographic data,the attribute information and the symbol code tables are made use of to link the database and the symbol software.After symbolization,geographic map is shaped,as provides the locate information.For the thematic data,after data preprocessing,corresponding mathematic models are selected according to the user＇s demands and the instruction of the knowledge database.On the basis of the models,the thematic symbol pool can be linked and corresponding symbol be selected.In this paper,database,model storage,symbol pool as well as their interface have been build.At the same time,knowledge storages have been taken great advantage of.Thus,from data collection,mathematic base planning,model matching to symbol selection and elements overlay,automatic thematic mapping is realized.