粗集方法在地图综合中的应用

摘要

提出根据地图空间信息的特征,对信息表进行如下处理：采取无监督的离散化方法对连续型条件属性进行离散化;遵循属性决策表的应用目的对空间目标进行模糊分类作为决策属性;利用粗集属性约简的方法计算各条件属性重要性;采用动态排序的方法对空间目标的重要性进行判断。该方法将粗集理论应用于地图综合对空间点目标的选取中,试验表明该方法合理有效。%On the basis of the feature of map spatial information,a method as below is proposed.First,discretize the continuous attributes by unsupervised discretization method.Second,classify the spatial objects fuzzily according to the application purpose,whose result will then serve as the decisional attribute.Third,calculate the importance of conditional attributes by attribute reduction of rough set.And finally,a dynamic assessment method is implemented for the spatial objects.The method applies rough set theory to spatial points＇ selection during map generalization,and the experiment shows its rationality and validity.