Contains(g1,g2)

Returns 1 or 0 to indicate whether g1 completely contains g2. This tests the opposite relationship as Within().

Crosses(g1,g2)

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:

Disjoint(g1,g2)

Returns 1 or 0 to indicate whether g1 is spatially disjoint from (does not intersect) g2.

Distance(g1,g2)

Returns as a double-precision number the shortest distance between any two points in the two geometries.

Equals(g1,g2)

Returns 1 or 0 to indicate whether g1 is spatially equal to g2.

Intersects(g1,g2)

Returns 1 or 0 to indicate whether g1 spatially intersects g2.

Overlaps(g1,g2)

Returns 1 or 0 to indicate whether g1 spatially overlaps g2. The term spatially overlaps is used if two geometries intersect and their intersection results in a geometry of the same dimension but not equal to either of the given geometries.

Related(g1,g2,pattern_matrix)

Returns 1 or 0 to indicate whether the spatial relationship specified by pattern_matrix exists between g1 and g2. Returns –1 if the arguments are NULL. The pattern matrix is a string. Its specification will be noted here if this function is implemented.

Touches(g1,g2)

Returns 1 or 0 to indicate whether g1 spatially touches g2. Two geometries spatially touch if the interiors of the geometries do not intersect, but the boundary of one of the geometries intersects either the boundary or the interior of the other.

Within(g1,g2)

Returns 1 or 0 to indicate whether g1 is spatially within g2. This tests the opposite relationship as Contains().