مضلع(A shape representing a single area in a coordinate system. It may have holes, but it does not have multiple disconnected regions, nor does it have any infinitely-thin spurs. Its borders are representable as line strings in the same coordinate system)
polygon In the vector type of GIS internal data organization spatial data are conveniently divided into point, line and polygon types. Some vector GIS store information in the form of points, line segments and point pairs; others maintain close lists of points defining polygon regions['pɔlɪgən]名词
