Name
ST_OptimalAlphaShape — Computes an Alpha-shape enclosing a geometry using an "optimal" alpha value.
Synopsis
geometry ST_OptimalAlphaShape(geometry geom, boolean allow_holes = false, integer nb_components = 1);
Descrizione
![[Warning]](../images/warning.png)
|
|
|
ST_OptimalAlphaShape is deprecated as of 3.5.0. Use CG_OptimalAlphaShape instead. |
Computes the "optimal" alpha-shape of the points in a geometry. The alpha-shape is computed using a value of α chosen so that:
-
the number of polygon elements is equal to or smaller than
nb_components(which defaults to 1) -
all input points are contained in the shape
The result will not contain holes unless the optional allow_holes argument is specified as true.
Availability: 3.3.0 - requires SFCGAL >= 1.4.1.
Questo metodo richiede il backend SFCGAL.