一个java实现的R树，R树在存储空间数据方面用处很大，特别是区域性的按空间划分的数据.这种结构用在数据库处理多维数据极为方便，oracle索引多维数据就是用的这种-A java implementation of the R-tree, R-tree in the storage space for data proved very useful, especially the regional space is divided into data for this structure in