The reduction attribute of decision tablewith above theory and method is given and the hidden knowledge is mined in theexample of urban spatial dada decision-making table, and the minimaldecision-making regulations are consequently got.

• 通过运用Rough集理论和方法对城市空间数据决策表的实例进行属性及属性值进行约简,挖掘其中隐含的知识,从而得出最小决策规则。 解决了城市中空间数据表达方式中的模糊性问题。