16.5.3.2 Spatial Operators

OpenGIS proposes a number of other functions that can produce geometries. They are designed to implement spatial operators.

These functions are not implemented in MySQL. They may appear in future releases.

Buffer(g,d)

Returns a geometry that represents all points whose distance from the geometry value g is less than or equal to a distance of d.
ConvexHull(g)

Returns a geometry that represents the convex hull of the geometry value g.
Difference(g1,g2)

Returns a geometry that represents the point set difference of the geometry value g1 with g2.
Intersection(g1,g2)

Returns a geometry that represents the point set intersection of the geometry values g1 with g2.
SymDifference(g1,g2)

Returns a geometry that represents the point set symmetric difference of the geometry value g1 with g2.
Union(g1,g2)

Returns a geometry that represents the point set union of the geometry values g1 and g2.