ST_AlphaShape — Computes an Alpha-shape enclosing a geometry

`geometry `

geometry **ST_AlphaShape**(`geom`, float `alpha`, boolean `allow_holes = false``)`

;

ST_AlphaShape is deprecated as of 3.5.0. Use CG_AlphaShape instead. |

Computes the Alpha-Shape of the points in a geometry. An alpha-shape is a (usually) concave polygonal geometry which contains all the vertices of the input, and whose vertices are a subset of the input vertices. An alpha-shape provides a closer fit to the shape of the input than the shape produced by the convex hull.