Fig 3：RNN query • 空间连接查询(Spatial Join Query): – 空间连接查询可以用来确定满足一个给定的连接谓词 关系的所有空间对象对。
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Multiway spatial join is the spatial join query which concern several spatial relations.
空间多路连接是涉及多个空间关系的连接查询。
We summarize that spatial index system should provides three kinds of spatial query, they are, spatial range query, nearest neighbor query, spatial join query.
本文总结出空间索引系统应提供的三类空间查询：空间范围查询、最近邻居查询、空间连接查询。
As a slightly more sophisticated example, here is a query involving a spatial join, that is, a join where the join predicate is a spatial function.
作为一个稍微复杂些的示例，下面给出一个涉及空间联结(即其中的联结谓词是空间函数的联结)的查询。
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