Click here to see the SAS code.
Click here to see the example.

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This map is an imitation (with slight variations and enhancements)
of some maps I saw in books by Mark Monmonier, such as
"How to Lie with Maps" and "Mapping it Out".

Mark Monmonier's map is also referenced from the following page
as a "US Visibility Map":
http://www.math.yorku.ca/SCS/Gallery/bright-ideas.html

I created these maps totally independently of MonMonier's "map data".
I drew the maps on gridded graph paper, and then estimated the 
x/y coordinates that you see below.

This map is very "efficient", as it only uses 349 x/y coordinates.
By comparison, v9 maps.us has 1525 x/y coordinates.

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