ST_Crosses

Determines if one GEOMETRY object spatially crosses another GEOMETRY object. If two objects touch only at a border, ST_Crosses returns FALSE.

Two objects spatially cross when both of the following are true:

• The two objects have some, but not all, interior points in common.

• The dimension of the result of their intersection is less than the maximum dimension of the two objects.

Behavior type

Syntax

ST_Crosses( g1, g2 )

Arguments

g1

Spatial object, type GEOMETRY

g2

Spatial object, type GEOMETRY

Returns

BOOLEAN

Supported data types

Data Type

GEOMETRY

Point

Yes

Multipoint

Yes

Linestring

Yes

Multilinestring

Yes

Polygon

Yes

Multipolygon

Yes

GeometryCollection

Yes

Examples

The following examples show how to use ST_Crosses.

=> SELECT ST_Crosses(ST_GeomFromText('LINESTRING(-1 3,1 4)'),
   ST_GeomFromText('LINESTRING(-1 4,1 3)'));
 ST_Crosses
------------
 t
(1 row)

=> SELECT ST_Crosses(ST_GeomFromText('LINESTRING(-1 1,1 2)'),
   ST_GeomFromText('POLYGON((1 1,0 -1,3 -1,2 1,1 1))'));
 ST_Crosses
------------
 f
(1 row)

=> SELECT ST_Crosses(ST_GeomFromText('POINT(-1 4)'),
   ST_GeomFromText('LINESTRING(-1 4,1 3)'));
ST_ Crosses
------------
 f
(1 row)