我也许可以帮助解决第 2 点……如何对现有地址进行地理编码。
更新
看起来 gmapi 有它自己的内置地理编码助手,所以你可能不需要我在下面粘贴的任何代码。请参阅:有人有使用 django-gmapi 进行地理编码的经验吗?
我使用了以下代码:
import urllib
from django.conf import settings
from django.utils.encoding import smart_str
from django.db.models.signals import pre_save
from django.utils import simplejson as json
def get_lat_long(location):
output = "csv"
location = urllib.quote_plus(smart_str(location))
request = "http://maps.google.co.uk/maps/api/geocode/json?address=%s&sensor=false" % location
response = urllib.urlopen(request).read()
data = json.loads(response)
if data['status'] == 'OK':
# take first result
return (str(data['results'][0]['geometry']['location']['lat']), str(data['results'][0]['geometry']['location']['lng']))
else:
return (None, None)
def get_geocode(sender, instance, **kwargs):
tlat, tlon = instance._geocode__target_fields
if not getattr(instance, tlat) or not getattr(instance, tlon):
map_query = getattr(instance, instance._geocode__src_field, '')
if callable(map_query):
map_query = map_query()
lat, lon = get_lat_long(map_query)
setattr(instance, tlat, lat)
setattr(instance, tlon, lon)
def geocode(model, src_field, target_fields=('lat','lon')):
# pass src and target field names as strings
setattr(model, '_geocode__src_field', src_field)
setattr(model, '_geocode__target_fields', target_fields)
pre_save.connect(get_geocode, sender=model)
(可能是我从某个 Github 项目中借来的,如果是,我已经失去了归属,抱歉!)
然后在您的模型上,您需要以下内容:
from django.db import models
from gmaps import geocode # import the function from above
class MyModel(models.Model):
address = models.TextField(blank=True)
city = models.CharField(max_length=32, blank=True)
postcode = models.CharField(max_length=32, blank=True)
lat = models.DecimalField(max_digits=12, decimal_places=6, verbose_name='latitude', blank=True, null=True, help_text="Will be filled automatically.")
lon = models.DecimalField(max_digits=12, decimal_places=6, verbose_name='longitude', blank=True, null=True, help_text="Will be filled automatically.")
def map_query(self):
"""
Called on save by the geocode decorator which automatically fills the
lat,lng values. This method returns a string to use as query to gmaps.
"""
map_query = ''
if self.address and self.city:
map_query = '%s, %s' % (self.address, self.city)
if self.postcode:
if map_query:
map_query = '%s, ' % map_query
map_query = '%s%s' % (map_query, self.postcode)
return map_query
geocode(Venue, 'map_query')
然后对现有数据进行地理编码,您可以重新保存所有现有记录,例如:
from .models import MyModel
for obj in MyModel.objects.all():
obj.save()