A script that downloads your Google Latitude data and saves it into separate JSON files. Check out my blog post on this: http://www.mplewis.com/octopress/blog/2013/07/13/downloading-your-google-location-history-with-the-google-api-python-client-library/

google_latitude_api_access.py

#!/usr/bin/python

import httplib2
import json
from apiclient.discovery import build
from oauth2client.file import Storage
from oauth2client.client import AccessTokenRefreshError
from oauth2client.client import OAuth2WebServerFlow
from oauth2client.tools import run
from datetime import datetime

CLIENT_ID = 'YOUR_CLIENT_ID_HERE'
CLIENT_SECRET = 'YOUR_CLIENT_SECRET_HERE'
REQUESTED_SCOPE = 'https://www.googleapis.com/auth/latitude.all.best'

if __name__ == '__main__':
    flow = OAuth2WebServerFlow(CLIENT_ID, CLIENT_SECRET, REQUESTED_SCOPE)
    
    storage = Storage('credentials.dat')
    credentials = storage.get()
    if credentials == None or credentials.invalid:
        credentials = run(flow, storage)

    http = httplib2.Http()
    http = credentials.authorize(http)

    latitude = build('latitude', 'v1', http=http)
        
    last_time = None
    num_reqs = 0

    try:
        while True:
            response = latitude.location().list(granularity='best', max_time=last_time).execute()
            try:
                locations = response['items']
            except KeyError:
                break # done with list

            num_reqs += 1

            with open('req_%s.json' % num_reqs, 'wb') as f:
                json.dump(locations, f)

            last_time = int(locations[len(locations) - 1]['timestampMs']) - 1

            print 'Request %s' % num_reqs
            print datetime.fromtimestamp(last_time/1000.0)

    except AccessTokenRefreshError:
        print 'Access token refresh error. Please restart the application to reauthorize.'