...yer(图层)都由同一类型的Feature(要素)组成，其数据来自某个Feature Class，如点状图层的数据来自点要素类(Point Feature Class)，线状图层来自线要素类(Line Feature Class)，面状图层来自多边形要素类(Polygon Feature Class)，因此Layer可理解为Feature Cl...
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气候要素对两类样点树木径向生长的影响不同。
Climatic factors had different effects on the radial growth of s.
其中基础类包是应用类包和组合类包的基础，它用点、线、面、体、复杂对象和关系类等基本的要素表示三维空间。
The base package including point class, line class, area class, volume class, complex object class and relation class, is the base of the application package and the combination package.
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