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samg/earth.rb

Last active December 30, 2015 05:29
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earth.rb
module Earth
extend self
def meters_between_two_points(p1, p2)
( 6378.0 * Math.acos([
Math.cos(p1.lat_in_radians) * Math.cos(p2.lat_in_radians) *
Math.cos(p2.lng_in_radians - p1.lng_in_radians) +
Math.sin(p1.lat_in_radians) * Math.sin(p2.lat_in_radians),
1
].min)) * 1000
end
end
# meters = Earth.meters_between_two_points(p1,p2)
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