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paulbrittain/haversine_distance.py

Last active January 25, 2018 18:07
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Haversine great-circle distance computational formula in Python
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haversine_distance.py
from math import sin, cos, sqrt, radians, atan2
def calculate_distance_between(input_longitude1, input_latitude1, input_longitude2, input_latitude2):
earth_radius = 6371.0
input_longitude1 = radians(input_longitude1)
input_latitude1 = radians(input_latitude1)
input_longitude2 = radians(input_longitude2)
input_latitude2 = radians(input_latitude2)
diff_longitude = abs(input_longitude2 - input_longitude1)
diff_latitude = abs(input_latitude2 - input_latitude1)
k = pow(sin(diff_latitude / 2), 2) + cos(input_latitude1) * cos(input_latitude2) * pow(sin(diff_longitude / 2), 2)
diff_sigma = 2 * atan2(sqrt(k), sqrt(1 - k))
# Output in kilometers
return earth_radius * diff_sigma
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