Created
August 27, 2017 04:59
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distance between two points on Earth, #geo
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defn haversine | |
[{lon1 :longitude lat1 :latitude} {lon2 :longitude lat2 :latitude}] | |
(let [R 6372.8 ; kilometers | |
dlat (Math/toRadians (- lat2 lat1)) | |
dlon (Math/toRadians (- lon2 lon1)) | |
lat1 (Math/toRadians lat1) | |
lat2 (Math/toRadians lat2) | |
a (+ (* (Math/sin (/ dlat 2)) (Math/sin (/ dlat 2))) (* (Math/sin (/ dlon 2)) (Math/sin (/ dlon 2)) (Math/cos lat1) (Math/cos lat2)))] | |
(* R 2 (Math/asin (Math/sqrt a))))) | |
(haversine {:latitude 36.12 :longitude -86.67} {:latitude 33.94 :longitude -118.40}) | |
;=> 2887.2599506071106 | |
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