Format Google Location data

google_location.py

import os
import json
import datetime

"""
I wanted to map where I'd been in the past year using DataMaps, a jQuery + D3
library for visualizing geospatial data. https://github.com/markmarkoh/datamaps
First I downloaded my data from Google https://www.google.com/settings/takeout
(I let them track my Android phone), and then used the script below to 
format the JSON the way DataMaps expects. 

Obviously this isn't production code. It's super slow, but I only needed to 
run it once, so...

Assumes the file you downloaded from Google is in a 'data' directory relative
to the current working directory, and that you only want locations from Jan 1 
of this year.
"""
cur_dir = os.path.dirname(os.path.realpath(__file__))
json_file = open(cur_dir + '/data/LocationHistory.json')
json_data = json.load(json_file)

fixed = []

first_of_year = datetime.datetime(2014, 1, 1)

for loc in json_data['locations']:
    # This is optional - I only wanted my results from after Jan 1 of this year
    if datetime.datetime.fromtimestamp(int(loc['timestampMs'])/1000.0) > first_of_year:
        fixed.append({
                'latitude': loc['latitudeE7'] * 0.0000001,
                'longitude': loc['longitudeE7'] * 0.0000001
            })

with open(cur_dir + '/data/fixed_this_year.json', 'w') as outfile:
    json.dump(fixed, outfile)