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SAS/GRAPH: Beyond the Basics by Robert Allison

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EXAMPLE 24  Plotting Coverage Areas on a Map

Purpose: Create circles with a radius of a given size, and place them at the desired latitude and longitude coordinates on a map.

Jenni, one of my co-workers who volunteers with the public radio stations of North Carolina, suggested this idea for a map. She thought it would be neat to see all the North Carolina public radio stations plotted on a map, with circles showing their estimated broadcast areas. I agreed that it was an excellent idea for a custom map.

This example involves two bits of custom programming:

Creating circles where the radius represents a geographical distance.

Placing those circles on a map at specific latitude and longitude coordinates.

I first create a county map for the ...

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