ST_Crosses - Amazon Redshift
SyntaxArgumentsReturn typeExamples

Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the blog post .

ST_Crosses

ST_Crosses returns true if the 2D projections of the two input geometries cross each other.

Syntax

ST_Crosses(geom1, geom2)

Arguments

geom1

A value of data type GEOMETRY or an expression that evaluates to a GEOMETRY type.

geom2

A value of data type GEOMETRY or an expression that evaluates to a GEOMETRY type.

Return type

BOOLEAN

If geom1 or geom2 is null, then an error is returned.

If geom1 or geom2 is a geometry collection, then an error is returned.

If geom1 and geom2 don't have the same value for the spatial reference system identifier (SRID), then an error is returned.

Examples

The following SQL checks if the first polygon crosses the second multipoint. In this example, the multipoint intersects both the interior and exterior of the polygon, which is why ST_Crosses returns true.

SELECT ST_Crosses (ST_GeomFromText('polygon((0 0,10 0,10 10,0 10,0 0))'), ST_GeomFromText('multipoint(5 5,0 0,-1 -1)'));

st_crosses              
-------------
 true

The following SQL checks if the first polygon crosses the second multipoint. In this example, the multipoint intersects the exterior of the polygon but not its interior, which is why ST_Crosses returns false.

SELECT ST_Crosses (ST_GeomFromText('polygon((0 0,10 0,10 10,0 10,0 0))'), ST_GeomFromText('multipoint(0 0,-1 -1)'));

st_crosses              
-------------
 false