ST_ForceCollection
Indietro  7.5. Editori di geometria  Avanti

Nome

ST_ForceCollection — Convert the geometry into a GEOMETRYCOLLECTION.

Sinossi

geometry ST_ForceCollection(geometry geomA);

Descrizione

Converts the geometry into a GEOMETRYCOLLECTION. This is useful for simplifying the WKB representation.

Miglioramento: nella versione 2.0.0 è stato introdotto il supporto per le superfici poliedriche.

Availability: 1.2.2, prior to 1.3.4 this function will crash with Curves. This is fixed in 1.3.4+

Changed: 2.1.0. Up to 2.0.x this was called ST_Force_Collection.

Questa funzione supporta le Polyhedral Surface.

Questa funzione supporta il 3d e non distrugge gli z-index.

Questo metodo supporta le Curve e le Circular String.

Esempi

Code
SELECT ST_ForceCollection('POLYGON((0 0 1,0 5 1,5 0 1,0 0 1),(1 1 1,3 1 1,1 3 1,1 1 1))');
Output
GEOMETRYCOLLECTION(POLYGON((0 0 1,0 5 1,5 0 1,0 0 1),(1 1 1,3 1 1,1 3 1,1 1 1)))
Figure
Geometry figure for visual-st-force-collection-01
Code
SELECT ST_ForceCollection('CIRCULARSTRING(220227 150406,2220227 150407,220227 150406)');
Output
GEOMETRYCOLLECTION(CIRCULARSTRING(220227 150406,2220227 150407,220227 150406))
Figure
Geometry figure for visual-st-force-collection-02

This example uses a PolyhedralSurface.

Code
SELECT ST_ForceCollection('POLYHEDRALSURFACE(((0 0 0,0 0 1,0 1 1,0 1 0,0 0 0)),
 ((0 0 0,0 1 0,1 1 0,1 0 0,0 0 0)),
 ((0 0 0,1 0 0,1 0 1,0 0 1,0 0 0)),
 ((1 1 0,1 1 1,1 0 1,1 0 0,1 1 0)),
 ((0 1 0,0 1 1,1 1 1,1 1 0,0 1 0)),
 ((0 0 1,1 0 1,1 1 1,0 1 1,0 0 1)))');
Output
GEOMETRYCOLLECTION(
  POLYGON((0 0 0,0 0 1,0 1 1,0 1 0,0 0 0)),
  POLYGON((0 0 0,0 1 0,1 1 0,1 0 0,0 0 0)),
  POLYGON((0 0 0,1 0 0,1 0 1,0 0 1,0 0 0)),
  POLYGON((1 1 0,1 1 1,1 0 1,1 0 0,1 1 0)),
  POLYGON((0 1 0,0 1 1,1 1 1,1 1 0,0 1 0)),
  POLYGON((0 0 1,1 0 1,1 1 1,0 1 1,0 0 1))
)
Figure
Geometry figure for visual-st-force-collection-03