18.5.3.2. 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.
