Compared with grid and R-tree, the index has slightly space costs but most higher index performance.

与网格索引和R树索引相比，该索引以略大的空间开销换取了更高的查找性能。

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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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In the study of GIS, there are three models: Monitor and Discover Service (MDS), the Relational Grid Monitoring Architecture (R-GMA) and RGIS.

在对网格信息服务的研究中涌现出了很多模型，本文主要介绍了三个模型：MDS、RGIS和R - GMA。

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