A Surface is a two-dimensional geometry. It is a noninstantiable class. Its only instantiable subclass is Polygon.
Surface Properties
A Surface is defined as a two-dimensional geometry.
The OpenGIS specification defines a simple Surface as 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 Surface is the set of closed curves corresponding to its exterior and interior boundaries.