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andersosthus/gist:2363499

Created April 11, 2012 23:40
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Ruby Haversine
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gistfile1.rb
def haversine(lat1, long1, lat2, long2)
dtor = Math::PI/180
r = 6378.14*1000
rlat1 = lat1 * dtor
rlong1 = long1 * dtor
rlat2 = lat2 * dtor
rlong2 = long2 * dtor
dlon = rlong1 - rlong2
dlat = rlat1 - rlat2
a = power(Math::sin(dlat/2), 2) + Math::cos(rlat1) * Math::cos(rlat2) * power(Math::sin(dlon/2), 2)
c = 2 * Math::atan2(Math::sqrt(a), Math::sqrt(1-a))
d = r * c
return d
end
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