Address geocoding with geopy

gistfile1.txt

import simplejson as json

from geopy.geocoders.googlev3 import GoogleV3
from urllib import urlopen

from django.conf import settings
from django.contrib.gis.geos import GEOSGeometry
from django.db.models import signals

from specials.models import Special


GEONAMES_TIMEZONE_API = "http://ws.geonames.org/timezoneJSON?lat=%(latitude)f&lng=%(longitude)f"


def geolocate_store(sender, instance, created, **kwargs):
    """
    Generate and save the coordinates for a store
    """
    if not instance.coordinates and instance.address:
        geocoder = GoogleV3()

        try:
            results = geocoder.geocode(u"%(address)s, %(postal_code)s" % {
                "address": instance.address.encode("ascii", "replace"),
                "postal_code": instance.postal_code.encode("ascii", "replace"),
            })

            address, coordinates = results
        except:
            coordinates = None

        if coordinates:
            try:
                timezone = json.load(urlopen(GEONAMES_TIMEZONE_API % {
                    "latitude": coordinates[0],
                    "longitude": coordinates[1],
                })).get("timezoneId", None)
            except KeyError:
                timezone = None

            instance.coordinates = GEOSGeometry("POINT(%f %f)" % (coordinates[1], coordinates[0]))

            if timezone:
                instance.timezone = timezone

            instance.save()


def geolocate_city(sender, instance, created, **kwargs):
    """
    Generate and save the coordinates for a city
    """
    if not instance.coordinates:
        geocoder = geocoders.Google(api_key=settings.GOOGLE_MAPS_SERVER_API_KEY)

        try:
            results = list(geocoder.geocode(u"%(city)s" % {
                "city": instance.name.encode("ascii", "replace"),
            }, exactly_one=False))

            address, coordinates = results[0]
        except:
            coordinates = None

        if coordinates:
            instance.coordinates = GEOSGeometry("POINT(%f %f)" % (coordinates[1], coordinates[0]))
            instance.save()