Comments on: Calculating Distance Between Latitude Longitude Pairs in Python

By: Dave

Dave — Tue, 08 Jun 2010 04:14:29 +0000

Thank you, this is exactly what I was looking for

By: Kashyap Puranik

Kashyap Puranik — Sat, 27 Mar 2010 13:40:57 +0000

Thanks ! It was useful. I had to calculate distance between two IP addresses. I used http://api.hostip.info and the above code to get it.

By: t

Thu, 23 Jul 2009 09:11:38 +0000

thank you, this saved us some time

By: k

Wed, 25 Feb 2009 15:12:19 +0000

THANK YOU! My colleagues and I also found this helpful.

By: Turadg

Turadg — Sun, 22 Feb 2009 04:35:29 +0000

After writing and posting that, I found this clean function,
http://code.google.com/p/geolocator/source/browse/trunk/geolocator/gislib.py

from this library,
http://code.google.com/p/geolocator/

which can be easy_install-ed from PyPi,
http://pypi.python.org/pypi/geolocator

By: Turadg

Turadg — Sun, 22 Feb 2009 04:27:54 +0000

+1, thanks.

I wanted it in meters so I looked up that conversion and here’s an adaptation:

# adapted from http://www.zachary.com/s/blog/2005/01/12/python_zipcode_geo-programming
import math

nauticalMilePerLat = 60.00721
nauticalMilePerLongitude = 60.10793
rad = math.pi / 180.0
metersPerNauticalMile = 1852

def metersGeoDistance(lat1, lon1, lat2, lon2):
“”"
Calculate distance between two lat lons in miles
“”"
yDistance = (lat2 – lat1) * nauticalMilePerLat
xDistance = (math.cos(lat1 * rad) + math.cos(lat2 * rad)) * (lon2 – lon1) * (nauticalMilePerLongitude / 2)

distance = math.sqrt( yDistance**2 + xDistance**2 )

return distance * metersPerNauticalMile

By: Adam

Adam — Wed, 04 Feb 2009 20:01:46 +0000

Yep, someone found this useful. In fact, considering the difficulty I was having translating an existing formula in PHP you have saved me having to learn a whole new language.

Thank you.