1) R-tree Index
R 树索引
3) R~* tree index
R*树索引
1.
This paper classified a series of methods on spatial index,including R tree,R+ tree and R~* tree indexes,pointing out that the R~* tree has higher node storage rate and sometimes can avoid node split.
在综述现有空间数据库索引技术的基础上,对比分析R树、R+树和R*树索引,认为R*树索引可获得较高的结点存贮利用率,还可以避免结点的分裂。
4) R*-tree index
R*-树索引
1.
Based on the projection-based model and analysing characteristics of the observer and his position, we proposed a new model for observer-orientation-based directional relations, established an R*R*-tree index for the query set.
然后结合新模型的特点,对方向关系查询空间建立了R*-树索引,利用拓扑学和矩形代数理论,提出了三步过滤法用以减少索引空间,降低了R*-树中矩形的重叠区域,减少了查询路径。
5) data source R-tree index
数据源R树索引
6) parallel R-tree indexing
并行R树索引
补充资料:海南龙血树(小花龙血树)
百合科Liliaceae
乔木状,高3-4m。叶聚生于茎和枝顶,几呈套叠状,长约70cm,抱茎,无柄。圆锥花序长约30cm,花序轴无毛或近无毛。分布于海南西南部,生于背风区的干燥砂土上。越南、柬埔寨也有分布。国家三级保护濒危种。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条