主要用于支持spatial indexing technology, 使用spatial index包括R-tree以及R-tree的扩展，可以进行包含坐标数据的index以及search-Used to support spatial indexing technology, including the use of spatial index R-tree and R-tree extension can contain coordinate data of the index and se

R-tree开源源码，用于将地理特别是路网数据以树的形态存储起来-R-tree source code for storing geographic data

Rtree的java实现，linux下运行，包括查询，增加，删除等功能-Rtree java realize, linux operation, including inquiries, increase, delete and other functions