如何获得点周围的边界多边形?
我有一个表,其中有数千个地址作为点。
postgis中是否有一个函数可以让我获得这些点周围的边界多边形并将其作为多边形返回?
更新 我正在寻找一个比边界矩形更复杂的多边形
I have a table with thousands of addresses as points.
Is there a function in postgis that will allow me to get a bounding polygon around these points and return it as a polygon?
update I am looking for a more complex polygon than just a bounding rectangle
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从您的问题中可能无法100%清楚您的意思是更多边界多边形。它可以被理解为
最小边界矩形(也称为MBR或信封),其中您可以使用ST_Envelope,ST_Box2D 或 ST_Extent,
作为包含给定几何图形内所有点的最小几何图形,凸包络 在这种情况下,您可以使用 ST_ConvexHull 甚至 ST_ExteriorRing 如果您的输入是多边形,
正如 Pimin 在下面的评论中指出的,ST_ConcaveHull 是另一个值得考虑的选项,自 PostGIS 2.0 起可用。 0.
It may be not 100% clear from your question what you mean as more bounding polygon. It may be understood as
minimum bounding rectangle (also known as MBR or envelope) for which you can use ST_Envelope, ST_Box2D or ST_Extent,
as s a minimum geometry which encloses all points within given geometry, a convex envelope and in this case you can use ST_ConvexHull or even ST_ExteriorRing if your input would be a polygon,
As Pimin pointed in the comments below, ST_ConcaveHull is another option worth to consider, available since PostGIS 2.0.0.
ST_Extent 提供一个聚合函数,该函数返回一个包围一组几何图形的边界框。
ST_Extent provides an aggregate function that returns a bounding box that bounds a set of geometries.