Created
December 13, 2018 18:34
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distance
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function distance(lat1, lon1, lat2, lon2) { | |
var p = 0.017453292519943295; // Math.PI / 180 | |
var c = Math.cos; | |
var a = 0.5 - c((lat2 - lat1) * p)/2 + | |
c(lat1 * p) * c(lat2 * p) * | |
(1 - c((lon2 - lon1) * p))/2; | |
return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km | |
} |
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