IRelationalOperator 接口：

1. Provides access to members that determine if a certain spatial relationship exists between two geometries.

　　Members

		Description
	Contains	Indicates if this geometry contains the other geometry. 前者是否包含后者！
	Crosses	Indicates if the two geometries intersect in a geometry of lesser dimension.
	Disjoint	Indicates if the two geometries share no points in common. Negate this result to compute the Intersect relation.
	Equals	Indicates if the two geometries are of the same type and define the same set of points in the plane.
	Overlaps	Indicates if the intersection of the two geometries has the same dimension as one of the input geometries. 前者和后者是否有重叠！不包括包含关系！
	Relation	Indicates if the defined relationship exists.
	Touches	Indicates if the boundaries of the geometries intersect.
	Within	Indicates if this geometry is contained (is within) another geometry. 前者是否在后者内部！

这边没有判断几何体相交的方法。

采用Relation来实现Intersects： RELATE(G1, G2, ‘T********‘)

1 string relationDescription = "RELATE(G1, G2, ‘T********‘)";2 isIntersects = (track as IRelationalOperator).Relation(ele.Geometry, relationDescription);3 if (isIntersects)4 {5 selectedcount++;6 pGraphicsContainerSelect.SelectElement(ele);7 }

ArcEngine 通过IRelationalOperator.Relation判断几何体相交