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专题地图的应用越来越广泛,但其生产和制作却存在若干问题。很多制图软件偏重于专题要素的处理与表达,对底图要素的研究较少。针对这一问题,文章介绍了专题地图的底图要素确定原则,分析了影响底图要素的因素,进而确定了底图要素的处理方法,包括坐标转换、投影变换、分类分级、显示处理等。最后以大比例尺陆地交通图为例,结合笔者所做工作,阐述了底图要素的处理流程,为专题地图的快速制作提供了一定的参考。 更多还原

【Abstract】 The application of thematic maps has become more extensive,but its production has some problems.Many professional graphics software emphasis on the thematic elements processing and expression,few studies on the basic map data.To solve this problem,the article introduces the determining principles of the basic data,analyzes the factors that affect the basic map data,and determines the treatments to the basic map data,including coordinate transformation,projection transformation,classification,dis...