universe polygon -- defines the part of the universe that is outside the perimeter of the area covered by other GT-polygons ("covered area") and completes the two-dimensional manifold.
universe polygon
The first record in a polygon attribute table. It represents the area beyond the outer boundary of the coverage. It's the only polygon that never has a label point, and so has a User-ID value of 0.
Polygon #1 is the "universe polygon," representing the outside of all other polygons. Polygon #2 (which is also denoted by labelpoint 2) is bounded by arcs 1 and 2.
These files are referred to as external files. For example, feature attribute tables are stored as external INFO data files maintained in the coverage directory. external polygon See universe polygon.
 See also: Attribute Table, Attribute, Polygon, Area, Coverage
  
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