Concentric radii around a site are unlimited in size and number. 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.