【摘要】 GIS通常包含各种大量的空间信息,空间数据索引的建立有利于提高空间数据的存储、检索效率。因此,对空间数据索引模型的研究具有重要的现实意义。OracleSpatial的R-树和四叉树是索引两种空间数据索引模型和空间数据双层查询模型。在Oracle8i对象关系型的数据库管理系统中,通过空间数据和属性数据的有效结合,利用OracleSpatial提供R-树和四叉树两种空间索引方式,可实现GIS中空间数据索引、检索功能,保证了空间数据查询的快速性和准确性。更多还原

【Abstract】 As the GIS involves a large number of spatial Information, spatial data index can improve the efficiency of the data store and data query and thus its study and establishment is of important realistic meaning. This paper shows that R-tree index and Quad-tree index and a two-tier query model for Oracle Spatial. As a new object-relational data base management system, Oracle Spatial combines the spatial data and attribute data effectively and provides R-tree index and Quad-tree index which ensure the rapidness and veracity of the spatial query. This paper implements spatial data index and search of GIS, which can ensure the quickness and exactness of the query and search results.更多还原