144 lines
4.8 KiB
Python
144 lines
4.8 KiB
Python
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from functools import partial
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from urllib.parse import urlencode
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from geopy.exc import GeocoderQueryError
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from geopy.geocoders.base import DEFAULT_SENTINEL, Geocoder
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from geopy.location import Location
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from geopy.util import logger
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__all__ = ("DataBC", )
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class DataBC(Geocoder):
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"""Geocoder using the Physical Address Geocoder from DataBC.
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Documentation at:
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http://www.data.gov.bc.ca/dbc/geographic/locate/geocoding.page
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"""
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geocode_path = '/pub/geocoder/addresses.geojson'
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def __init__(
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self,
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*,
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scheme=None,
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timeout=DEFAULT_SENTINEL,
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proxies=DEFAULT_SENTINEL,
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user_agent=None,
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ssl_context=DEFAULT_SENTINEL,
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adapter_factory=None
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):
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"""
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:param str scheme:
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See :attr:`geopy.geocoders.options.default_scheme`.
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:param int timeout:
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See :attr:`geopy.geocoders.options.default_timeout`.
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:param dict proxies:
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See :attr:`geopy.geocoders.options.default_proxies`.
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:param str user_agent:
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See :attr:`geopy.geocoders.options.default_user_agent`.
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:type ssl_context: :class:`ssl.SSLContext`
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:param ssl_context:
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See :attr:`geopy.geocoders.options.default_ssl_context`.
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:param callable adapter_factory:
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See :attr:`geopy.geocoders.options.default_adapter_factory`.
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.. versionadded:: 2.0
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"""
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super().__init__(
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scheme=scheme,
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timeout=timeout,
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proxies=proxies,
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user_agent=user_agent,
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ssl_context=ssl_context,
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adapter_factory=adapter_factory,
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)
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domain = 'apps.gov.bc.ca'
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self.api = '%s://%s%s' % (self.scheme, domain, self.geocode_path)
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def geocode(
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self,
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query,
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*,
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max_results=25,
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set_back=0,
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location_descriptor='any',
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exactly_one=True,
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timeout=DEFAULT_SENTINEL
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):
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"""
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Return a location point by address.
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:param str query: The address or query you wish to geocode.
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:param int max_results: The maximum number of resutls to request.
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:param float set_back: The distance to move the accessPoint away
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from the curb (in meters) and towards the interior of the parcel.
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location_descriptor must be set to accessPoint for set_back to
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take effect.
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:param str location_descriptor: The type of point requested. It
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can be any, accessPoint, frontDoorPoint, parcelPoint,
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rooftopPoint and routingPoint.
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:param bool exactly_one: Return one result or a list of results, if
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available.
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:param int timeout: Time, in seconds, to wait for the geocoding service
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to respond before raising a :class:`geopy.exc.GeocoderTimedOut`
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exception. Set this only if you wish to override, on this call
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only, the value set during the geocoder's initialization.
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:rtype: ``None``, :class:`geopy.location.Location` or a list of them, if
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``exactly_one=False``.
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"""
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params = {'addressString': query}
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if set_back != 0:
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params['setBack'] = set_back
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if location_descriptor not in ['any',
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'accessPoint',
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'frontDoorPoint',
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'parcelPoint',
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'rooftopPoint',
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'routingPoint']:
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raise GeocoderQueryError(
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"You did not provided a location_descriptor "
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"the webservice can consume. It should be any, accessPoint, "
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"frontDoorPoint, parcelPoint, rooftopPoint or routingPoint."
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)
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params['locationDescriptor'] = location_descriptor
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if exactly_one:
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max_results = 1
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params['maxResults'] = max_results
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url = "?".join((self.api, urlencode(params)))
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logger.debug("%s.geocode: %s", self.__class__.__name__, url)
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callback = partial(self._parse_json, exactly_one=exactly_one)
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return self._call_geocoder(url, callback, timeout=timeout)
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def _parse_json(self, response, exactly_one):
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# Success; convert from GeoJSON
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if not len(response['features']):
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return None
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geocoded = []
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for feature in response['features']:
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geocoded.append(self._parse_feature(feature))
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if exactly_one:
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return geocoded[0]
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return geocoded
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def _parse_feature(self, feature):
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properties = feature['properties']
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coordinates = feature['geometry']['coordinates']
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return Location(
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properties['fullAddress'], (coordinates[1], coordinates[0]),
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properties
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)
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