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edymerchk/distance.coffee

Created September 11, 2014 20:44
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distance.coffee
# based on Haversine formula
# http://en.wikipedia.org/wiki/Haversine_formula
distance = (lat1, lon1, lat2, lon2) ->
R = 6371
a = 0.5 - Math.cos((lat2 - lat1) * Math.PI / 180) / 2 + Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) * (1 - Math.cos((lon2 - lon1) * Math.PI / 180)) / 2
R * 2 * Math.asin(Math.sqrt(a))
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