CROSSES

Synonym for ST_CROSSES. Checks if two geometries cross, meaning they share some interior points but not all, and the intersection has a lower dimension.

Syntax

Crosses(g1,g2)

Description

Returns 1 if g1 spatially crosses g2. Returns NULL if g1 is a Polygon or a MultiPolygon, or if g2 is a Point or a MultiPoint. Otherwise, returns 0.

The term spatially crosses denotes a spatial relation between two given geometries that has the following properties:

• The two geometries intersect.

• Their intersection results in a geometry that has a dimension that is one less than the maximum dimension of the two given geometries.

• Their intersection is not equal to either of the two given geometries.

CROSSES() is based on the original MySQL implementation, and uses object bounding rectangles, while ST_CROSSES() uses object shapes.

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