external polygonSee universe polygon.
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feature attribute tableA table used to store attribute information for a specific coverage feature class. ARC/INFO maintains the first several items of these tables.
external polygon
In coverages, the first record in a polygon attribute table, representing the area beyond the outer boundary of the coverage.
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Also referred to as the external polygon. upstream In tracing, upstream is the direction along the arcs that is against the direction of flow. Direction of flow is determined by a user-defined convention. See directed network.
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. Its area equals the negative sum of all the polygons in the coverage. Also referred to as the external polygon.
 See also: Accuracy, Survey, Elevation, Image, Location
  
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