README.md

distance

Calculate distance (in miles) between two coordinates on the map using Python/C API

Installation

python setup.py install

Usage

>>> import distance
>>> distance.compute('10.1', '12.1', '10.1', '10.1')
135.95027527032235

Сomparison

import distance
import math

from decimal import Decimal

lat1 = lng2 = lat2 = Decimal('10.1')
lng1 = Decimal('12.1')


def compute_distance(lat1d, lon1d, lat2d, lon2d):
    lat1 = math.radians(lat1d)
    lat2 = math.radians(lat2d)
    lon1 = math.radians(lon1d)
    lon2 = math.radians(lon2d)
    R = 3956  # miles
    d_miles = math.acos(math.sin(lat1) * math.sin(lat2) + math.cos(lat1) * math.cos(lat2) * math.cos(lon2 - lon1)) * R
    return d_miles


%timeit distance.compute(str(lat1), str(lng1), str(lat2), str(lng2))
100000 loops, best of 3: 6.11 us per loop

%timeit compute_distance(lat1, lng1, lat2, lng2)
100000 loops, best of 3: 8.55 us per loop

Checked under Python 2.7 and Python 3.3

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