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

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)