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Let's say I plotted the position of a helicopter every day for the past year and came up with the following map: Any human looking at this would be able to tell me that this helicopter is based out of Chicago. How can I find the same result in code? I'm looking for something like this: $geoCodeArray = array([GET=http://pastebin.com/grVsbgL9]); function findHome($geoCodeArray) { // magic return $geoCode; } Ultimately generating something like this: UPDATE: Sample Dataset Here's a map with a sample dataset: http://batchgeo.com/map/c3676fe29985f00e1605cd4f86920179 Here's a pastebin of 150 geocodes: http://pastebin.com/grVsbgL9 The above contains 150 geocodes. The first 50 are in a few clusters close to Chicago. The remaining are scattered throughout the country, including some small clusters in New York, Los Angeles, and San Francisco. I have about a million (seriously) datasets like this that I'll need to iterate through and identify the most likely "home". Your help is greatly appreciated. UPDATE 2: Airplane switched to Helicopter The airplane concept was drawing too much attention toward physical airports. The coordinates can be anywhere in the world, not just airports. Let's assume it's a super helicopter not bound by physics, fuel, or anything else. It can land where it wants. ;)

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