[thelist] Zip Code Distance From

Joel D Canfield joel at streamliine.com
Wed Mar 28 12:11:24 CDT 2007

> Ok, I'm scared:
> ~~~~~~~~~~~~~~~~~~
> The right way to calculate distance is with spherical trig. 

it sounds hard, but there are tools that do the math; fairly sure PHP and Perl both have bits already done where all you do is give it coords and it does the math. just heading out the door so I can't track down the examples I've got here somewhere; sorry.

you don't actually have to know how to calculate great circle distances, you just need a trustworthy black box.


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