According to the characteristics of spatial index of grids and R-tree, a hybrid structure of spatial multilevel index is presented based on grid and R-tree.

结合网格索引和R树索引的特点，提出了一种基于网格与R树的多级混合索引。

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A rectangular region of geography is roughly partitioned in several times to multilevel sub-regions, in which spatial index of R-tree has been constructed.

该方案首先将矩形地理空间进行租网格划分建立多级网格索引，然后针对每个小网格建立基于R树的空间索引。

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Advanced multilevel deep linking system which not only lets you have unlimited number of pages, but also enables search engines to easily index the pages.

先进的多级深连接系统，不但让你有无限数量的页面，又可以使搜索引擎容易指数的页。

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