Many professional graphics software emphasis on the thematic elements processing and expression, few studies on the basic map data.
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。
Many professional graphics software emphasis on the thematic elements processing and expression, few studies on the basic map data.
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。
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