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the classification of thematic map elements
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the classification of thematic map elements
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工学
专题地图内容设计
释
the classification of thematic map elements
专题地图要素分类分级
为了有效地描述和详细表示地图专题要素的属性特征,将大量的实体或现象抽象概括成少量群类,以揭示出物体和现象在地理空间上的发展和变化规律。
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pollution by mercury
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