A Surface is a two-dimensional geometry. It
is a non-instantiable 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.
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