[英]Mysql: find polygon within certain radius
In my database I have polygons stored. 在我的数据库中,我存储了多边形。 Now I need to search all the polygons that are within a certain radius.
现在,我需要搜索特定半径内的所有多边形。 Even if the polygon is only a small part inside the region, then it should be included inside the results (so once there is a minimal match, there is a match).
即使多边形仅是区域内的一小部分,也应将其包括在结果内(因此,一旦存在最小匹配,就存在匹配)。
What is the best way to do this? 做这个的最好方式是什么? I have been thinking about creating another polygon and search everything that intersects this, but don't know if this is a valid method?
我一直在考虑创建另一个多边形并搜索与此相交的所有内容,但不知道这是否是有效方法?
Yes, I think it is the best approach. 是的,我认为这是最好的方法。 You can create a polygon using ST_BUFFER and then you can use ST_INTERSECT to find if polygons will intersect your polygon.
您可以使用ST_BUFFER创建多边形,然后可以使用ST_INTERSECT查找多边形是否会与您的多边形相交。
May be you can also do it using ST_DISTANCE . 也许您也可以使用ST_DISTANCE做到这一点 。 It will calculate minimum distance of a point from polygon.
它将计算点到多边形的最小距离。
Select ST_DISTANCE(polygons,POINT(x, y)) as distance, polygon_id from your_polygon_table WHERE distance <= 10
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