An S4 Class for representing a spatial plateau object
componentA list of components.
suppAn sfg object that stores the union of the spatial objects of the components of the spatial plateau object.
typeThe data type of the spatial plateau object.
A pgeometry object is composed of a list of component objects, an sfg object that represents
the union of all crisp spatial objects of its components (i.e., the support), and its data
type, which can be either PLATEAUPOINT, PLATEAULINE, or PLATEAUREGION.