距离连接在空间数据库中有着广泛的应用，而距离连接的选择度估计是优化距离查询的基础。
Distance join is widely used in spatial database. Selectivity estimation for distance join is the basis of optimizing the query of the distance.
其他脚本在提供的数据示例上测试实现的机制，并给出一个基于距离的查询示例，而且与地图图像结合在一起。
Additional scripts test the implemented mechanisms on the provided sample data and show an example of a distance-based query, complete with map images.
对距离的理解，或者说对查询的输出行为的理解，对于为不同查询选择最有效的选项是至关重要的。
Understanding the distance, or the queries' output behavior, is crucial in determining the most effective option for the individual query.
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