空间数据库中基于对象的方位查询研究

研究了基于对象的方位查询处理方法，提出一种全新的基于模型的开放策略，使得查询时不必知晓嵌入式世界坐标系的边界，同时省去了与坐标边界相关的计算问题．以OSS为模型的查询算法，通过提高传送效率来减少I／O和CPU的设备开销．实验数据表明开放模型策略(OSS)在性能上超越从前的变换查询策略(RQS)，比RQS更适合对大的数据集合进行处理。

Study on directional query in spatial databases based on object

This paper explores the processing of directional query in spatial databases based on object and proposes a new open shape-based strategy (OSS). The proposed strategy OSS makes it unnecessary to know the boundary of the embedding world coordinate and also eliminates the computation related to the world boundary. OSS reduces both I/O and CPU costs by greatly improving the filtering effectiveness .The experimental evaluation showed that OSS consistently outperforms classical range query strategies (RQS) and OSS is more scalable than RQS for large data sets.