Customer management tool. Demonstrates loading customer location data from JSON file and calculating Great Circle Distance (Vincenty formula) to find local customers.

usage: customers.py [-h] [--file JSONFILE] [--origin ORIGIN] [--within WITHIN]

optional arguments: -h, --help show this help message and exit --file JSONFILE path to customer data --origin ORIGIN calculate distance to customers from this point, e.g. 53.3381985,-6.2592576 --within WITHIN radius to search for customers from the origin

Find customers within 100km of the specified lat,long.

customers.py --file customers.txt --origin 53.3381985,-6.2592576 --within 100