R树，具有搜索，添加，删除节点能，利用R树，可以为空间搜索速度带来很大的提升，是GIS中必备的一种算法,R tree, with the search, add, delete nodes can use R trees, you can search for the space a great deal of speed upgrade is necessary for GIS in an algorithm

TREES PROGRAM IMPLEMENTAION DATA STRUCTRES