From: Hank
Date: October 9 2005 3:12pm
Subject: Re: Distance between Zip codes
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Don't forget that you're not caclucating "driving distance", but
"great circle" distance, which is roughly a straight line over short
distances.  If you radius is great than, say 50 miles, people might
complain that the actual driving distance is much greater than the
straight line distance you provided.

--

-Hank

mysql, query