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On the basis of deep analysis to the Apriori algorithm. In this paper, the HMT (HASH MAPPING TABLE) and HASH_TREE methodologies are used to optimize space complexity and time complexity. Using the HMT compressed Item sets, HASH_TREE can decentralize support count process. The result of experimental show that, space complexity and time complexity of Apriori algorithm is Efficiency reduced by using...
Expression and definition of spatial relationship are crucial for spatial data mining. A new method of spatial relationship expression based on DE-9IM theory is proposed. The accurate spatial topology relationship between different objects can be expressed when this method is used in multi-level association rules discovery. The corresponding algorithm is also implemented and efficiency is enhanced...
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