Sectors divide a study area into segments, like a pie that has been cut into pieces. Polygons are areas that are defined by a series of line segments. Polygons may have as few as three points or as many as several thousand. Polygons are most effective when a map of the study area is provided. Corridors are equal bandwidths on both sides of a line.
Cuts are lines that subdivide a ring or polygon based on the proximity of competitor sites.
Geographic Areas - states, counties, ZIP Codes, etc. United States Summary is the entire 50 states and the District of Columbia States include the 50 states plus the District of Columbia that is counted as a state. Data are not available for Guam, the U.S. Virgin Islands, American Samoa or other outlying U.S. territories. 1990 data are available for Puerto Rico. Boroughs and census tracts are equivalent to counties in Alaska, while parishes are the county equivalents in Louisiana.