mysql - 空间数据类型用于什么？

Question

我用谷歌搜索了这个，找不到足够好的答案。

空间数据类型（几何、点、多点）到底是做什么用的？

Answer 1

A space filling curve is an example for a spatial index method. Mathematically it's H(x,y)=(h(X), h(Y)). It's a curve that fills the surface completely and also subdivide it. It's also reduce the dimension and because it's a curve it traverse only adjacent cells. It's similar to a quadtree spatial index which is also often use for nearest-neighbor search. Source:http://en.m.wikipedia.org/wiki/Spatial_database

Answer 2

您可以将这些类型用于具有坐标系的任何事物，地球上位置的纬度和经度，客户位置或区域是地理类型的典型用途。您还可以为任何具有 x,y 样式尺寸、建筑物平面图、接线图或 CAD 模型（如果您愿意的话）使用几何类型保留任意坐标。

当您对数据有空间索引时，空间数据类型的真正威力就会发挥作用——这允许像“找到最近的……”或“……之间的距离是多少”这样的查询非常快。