Calculate distance between latitude longitude pairs with Python

haversine.py

#!/usr/bin/env python

# Haversine formula example in Python
# Author: Wayne Dyck

import math

def distance(origin, destination):
    lat1, lon1 = origin
    lat2, lon2 = destination
    radius = 6371 # km

    dlat = math.radians(lat2-lat1)
    dlon = math.radians(lon2-lon1)
    a = math.sin(dlat/2) * math.sin(dlat/2) + math.cos(math.radians(lat1)) \
        * math.cos(math.radians(lat2)) * math.sin(dlon/2) * math.sin(dlon/2)
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a))
    d = radius * c

    return d

Hello i have two co-ordinates values sources and destination ,my source co-ordinates values are changing when i move robot , for that i have to calculate the distance for each positional values pls help me how to write python code for that

#I am adding the code to calculate the distance between two coordinates, you can call this function inside a for loop to get the distance between source and destination as soon as your bot makes a displacement.

def distance(source , destination): 
    lat1, lon1 = source [0],source [1]
    lat2, lon2 = destination[0],destination[1]
    radius = 6371 # km
    dlat = math.radians(lat2-lat1)
    dlon = math.radians(lon2-lon1)
    a = math.sin(dlat/2) * math.sin(dlat/2) + math.cos(math.radians(lat1)) \
        * math.cos(math.radians(lat2)) * math.sin(dlon/2) * math.sin(dlon/2)
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a))
    d = radius * c
    d = d*1000  #Converting distance to Metre as bot will make small displacements
    return d

#CALLING THE FUNCTION

source = [lat1, lon1] #Coordinates for the initial position of the robot
distance_measured = 0 #initially total distance covered by bot is 0.
Loop:
   new_latitude = GPS.latitude #  get current latitude of bot
   new_longitude = GPS.longitude # get current longitude bot
   destination = [new_latitude , new_longitude ]
   if (distance(source, destination) != 0):
         distance_measured = distance_measured + distance(source, destination)
         last_latitude = new_latitude  
	 last_longitude = new_longitude
         source =[last_latitude,last_longitude] 

Hope this helps!!

Hello, thank you very much for this masterpiece. But my concern is how to do so when you have an excel file, I have bunch of cities and finding the distance from those cities to one reference point (which is also a city). Thanks

Hello @Zagroz, did you able to find the distances from an excel file using this code? I am also stuck in similar kind of situation. Thank you!

Hello, thank you very much for this masterpiece. But my concern is how to do so when you have an excel file, I have a bunch of cities and finding the distance from those cities to one reference point (which is also a city). Thanks

Hello @Zagroz, did you able to find the distances from an excel file using this code? I am also stuck in a similar kind of situation. Thank you!

Hello, I have implemented something similar to what you are trying to do. You can visit my repo which involves what you desire. The link is here:

https://github.com/vivek1240/k-means-clustering-via-haversine-distance-/blob/master/clustering_stores_via_haversine_distance_kmeans.ipynb

Please inform if this solves your problem.
All the Best!!

Thanks for the eloquent and easily understandable code!

Thanks for this, can anyone explain what are 'a' and 'c' assignments , can we have better names for these variables ?