R-tree用于索引多维数据对象，利用数据对象间的相对位置建立最小边界矩形(MBR),可在此结构上完成高效查询算法如kNN与范围查询-R-tree Index for multi-dimensional data objects, using data objects between the relative position of the establishment of the minimum boundary rectangle (MBR), this structure can be c