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Return the Concave Hull of polygon A, with alpha set to pctConvex[0, 1] in the Delaunay Triangulation method, the concave hull will not contain a hole unless allowHoles is set to true ST_ConcaveHull

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Signatures

ST_ConcaveHull (A: Geometry, pctConvex: Double)

ST_ConcaveHull (A: Geometry, pctConvex: Double, allowHoles: Boolean)

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Parameters

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A
Geometry
required
The input geometry.
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pctConvex
Double
required
The pct convex value.
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allowHoles
Boolean
The allow holes value.

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Return type

The resulting geometry.

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Example

SELECT ST_ConcaveHull(ST_GeomFromWKT('POLYGON((175 150, 20 40, 50 60, 125 100, 175 150))'), 1)

POLYGON ((125 100, 20 40, 50 60, 175 150, 125 100))