Created
November 11, 2010 23:20
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Haversine formula (http://en.wikipedia.org/wiki/Haversine_formula) in Ruby
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class Numeric | |
def to_rad | |
self * Math::PI / 180 | |
end | |
end | |
# http://www.movable-type.co.uk/scripts/latlong.html | |
# loc1 and loc2 are arrays of [latitude, longitude] | |
def distance loc1, loc2 | |
lat1, lon1 = loc1 | |
lat2, lon2 = loc2 | |
dLat = (lat2-lat1).to_rad; | |
dLon = (lon2-lon1).to_rad; | |
a = Math.sin(dLat/2) * Math.sin(dLat/2) + | |
Math.cos(lat1.to_rad) * Math.cos(lat2.to_rad) * | |
Math.sin(dLon/2) * Math.sin(dLon/2); | |
c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); | |
d = 6371 * c; # Multiply by 6371 to get Kilometers | |
end |
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Borrowed this for an example in our server monitoring tools.
Thanks!