Radius of multiple latitude/longitude points

Posted by zekial on Stack Overflow See other posts from Stack Overflow or by zekial
Published on 2010-04-26T20:28:42Z Indexed on 2010/04/26 20:33 UTC
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math

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mysql

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ruby

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geography

I have a program that takes as input an array of lat/long points. I need to perform a check on that array to ensure that all of the points are within a certain radius. So, for example, the maximum radius I will allow is 100 miles. Given an array of lat/long (coming from a MySQL database, could be 10 points could be 10000) I need to figure out if they will all fit in a circle with radius of 100 miles.

Kinda stumped on how to approach this. Any help would be greatly appreciated.

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