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Radius and Corridor samples offer a more specialized approach and are geometric in nature.
Radius samples
The radius sampling method provides a sample of listed phone records, randomly selected from Postal Codes or Zip Codes whose centroids are located within a specified distance from any geographic target coordinates in the US or Canada.
Corridor Samples
The corridor sampling method provides a sample of listed phone records, randomly selected from Postal Codes or Zip Codes whose centroids are located within a specified distance from a line on a map. The target coordinates define the extremity of the line or corridor. This can be a road or section of a road represented by two sets of coordinates.
For a PDF version of this information please refer to the link in the Resources section on this page.
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