ST_Normalize
Name
ST_Normalize — Return the geometry in its canonical form.
Synopsis
geometry
ST_Normalize
(
geometry
geom
)
;
Description
Returns the geometry in its normalized/canonical form. May reorder vertices in polygon rings, rings in a polygon, elements in a multi-geometry complex.
Mostly only useful for testing purposes (comparing expected and obtained results).
Availability: 2.3.0
Examples
SELECT ST_AsText(ST_Normalize(ST_GeomFromText(
'GEOMETRYCOLLECTION(
POINT(2 3),
MULTILINESTRING((0 0, 1 1),(2 2, 3 3)),
POLYGON(
(0 10,0 0,10 0,10 10,0 10),
(4 2,2 2,2 4,4 4,4 2),
(6 8,8 8,8 6,6 6,6 8)
)
)'
)));
st_astext
----------------------------------------------------------------------------------------------------------------------------------------------------
GEOMETRYCOLLECTION(POLYGON((0 0,0 10,10 10,10 0,0 0),(6 6,8 6,8 8,6 8,6 6),(2 2,4 2,4 4,2 4,2 2)),MULTILINESTRING((2 2,3 3),(0 0,1 1)),POINT(2 3))
(1 row)