ST_ConcaveHull¶

Returns a concave hull enclosing the input geometry.

Usage¶

geometry ST_ConcaveHull(geom: geometry, pct_convex: double)

Arguments¶

geom (geometry)
pct_convex (double)

Description¶

Returns a concave hull enclosing the input geometry. The pct_convex parameter controls how “tight” the hull is: 1.0 produces the convex hull, while smaller values produce tighter, more concave shapes.

Examples¶

SELECT ST_ConcaveHull(
    ST_GeomFromText('LINESTRING(100 150, 50 60, 70 80, 160 170)'),
    0.3
);

┌──────────────────────────────────────────────────────────────────────────────┐
│ st_concavehull(st_geomfromtext(Utf8("LINESTRING(100 150, 50 60, 70 80, 160 1 │
│                             70)")),Float64(0.3))…                            │
╞══════════════════════════════════════════════════════════════════════════════╡
│ POLYGON((70 80,50 60,100 150,160 170,70 80))                                 │
└──────────────────────────────────────────────────────────────────────────────┘