module Calculations

Constants

RADIUS: Haversine formula for spherical distance See: rosettacode.org/wiki/Haversine_formula#Ruby

Public Class Methods

deg2rad(lat, long) click to toggle source

# File lib/klimt/util/calculations.rb, line 14
def self.deg2rad(lat, long)
  [lat * PI / 180, long * PI / 180]
end

spherical_distance(start_latlng, end_latlng) click to toggle source

# File lib/klimt/util/calculations.rb, line 8
def self.spherical_distance(start_latlng, end_latlng)
  lat1, long1 = deg2rad(*start_latlng)
  lat2, long2 = deg2rad(*end_latlng)
  2 * RADIUS * asin(sqrt(sin((lat2 - lat1) / 2)**2 + cos(lat1) * cos(lat2) * sin((long2 - long1) / 2)**2))
end