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Shape comparison language

首先说说我遇到的一个问题：

IRelationalOperator.Overlaps方法使用的时候无法查询得到所有的相交对象。看下说明，相交部分包含在每一个对象中而不等有任何一个对象。

Two geometries overlap if the region of their intersection is of the same dimension as the geometries involved and is not equivalent to either of the geometries.  Overlaps is a Clementini operator.

还有就是在使用ITopologicalOperator.Intersect方法返回的IGeometry不是null，而是需要通过其属性IsEmpty来判断！

   

空间关系用查询几何体和被请求的几何体的边界，内部，外部之间的相交关系来定义。

Each character in the string represents a relationship between the query geometry and the geometry being tested, and can have a value of T (true), F (false), or * (not tested).

The following table shows the relationships represented by each character:

		Requested geometry
		Interior	Boundary	Exterior
Query geometry	Interior	1	2	3
	Boundary	4	5	6
	Exterior	7	8	9

扩展九交模型

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