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 tree to achieve the R, R tree in the storage space data very useful, in particular, according to the regional breakdown of the data space. this database structure us