The State in which the urban area is located was also added. Some smaller polygons that represent undeveloped areas within the urban area were removed and merged with the larger urban area. Military reservations were also removed. Finally, the attribute for State FIPS was added. The spellings for San Francisco, CA and Bismarck, ND were corrected.
Urban areas are places where large populations exist.
The representation of the entity in the data. A 2-dimensional element. The size of the shape in coverage units. The perimeter of the shape in coverage units. User-assigned feature number.