Surface is a two-dimensional geometry. It
is a noninstantiable class. Its only instantiable subclass is
Surfaceis defined as a two-dimensional geometry.
The OpenGIS specification defines a simple
Surfaceas a geometry that consists of a single “patch” that is associated with a single exterior boundary and zero or more interior boundaries.
The boundary of a simple
Surfaceis the set of closed curves corresponding to its exterior and interior boundaries.