结合示例分析运算，验证理论和方法的可行性。
Finally the paper gives an example to verify the theory and method.
有向树计数的大小，是影响线性网络拓扑分析运算效率的一个重要因素。
Counting directed trees plays an essential role in computational efficiency of topological analysis in the linear network.
由于空间数据量较大，如何快速准确地完成空间叠值分析运算是GIS系统中比较关键的技术。
Because of large amount of spatial data in this operation, it is a critical technique in GIS about how to realize spatial overlap analysis very quickly with higher accuracy.
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