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Research of geographic Spatial Database

WANG Yu-xiang, ZHANG Yan, YANG Chong-jun(1. Institute of Remote Sensing Applications, CAS, Beijing 100101, China; 2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China)  
In this article, properties of geographic spatial database are analyzed. Then an algorithm of R+_tree spatial index is implemented for spatial index, to improve the spatial search efficiency. At last, an example of spatial database is given.
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