# © Copyright 2022, Scott Gasch
"""Wrapper around US Census address geocoder API described here:
-https://www2.census.gov/geo/pdfs/maps-data/data/Census_Geocoder_User_Guide.pdf
-https://geocoding.geo.census.gov/geocoder/Geocoding_Services_API.pdf
+
+* https://www2.census.gov/geo/pdfs/maps-data/data/Census_Geocoder_User_Guide.pdf
+* https://geocoding.geo.census.gov/geocoder/Geocoding_Services_API.pdf
+
+Also try::
+
+ --form benchmark=2020 \
+ https://geocoding.geo.census.gov/geocoder/locations/addressbatch \
+ --output geocoderesult.csv
"""
+import json
import logging
from typing import Any, Dict, List, Optional
def geocode_address(address: str) -> Optional[Dict[str, Any]]:
- """Send a single address to the US Census geocoding API. The response
- is a parsed JSON chunk of data with N addressMatches in the result
- section and the details of each match within it. Returns None on error.
+ """Send a single address to the US Census geocoding API in order to
+ lookup relevant data about it (including, if possible, its
+ lat/long). The response is a parsed JSON chunk of data with N
+ addressMatches in the result section and the details of each match
+ within it.
+
+ Args:
+ address: the full address to lookup in the form: "STREET
+ ADDRESS, CITY, STATE, ZIPCODE". These components may be
+ omitted and the service will make educated guesses but
+ the commas delimiting each component must be included.
+
+ Returns:
+ A parsed json dict with a bunch of information about the
+ address contained within it. Each 'addressMatch'
+ in the JSON describes the details of a possible match.
+ Returns None if there was an error or the address is
+ not known.
>>> json = geocode_address('4600 Silver Hill Rd,, 20233')
>>> json['result']['addressMatches'][0]['matchedAddress']
'4600 SILVER HILL RD, WASHINGTON, DC, 20233'
>>> json['result']['addressMatches'][0]['coordinates']
- {'x': -76.92743, 'y': 38.84599}
-
+ {'x': -76.9274328556918, 'y': 38.845989080537514}
"""
url = 'https://geocoding.geo.census.gov/geocoder/geographies/onelineaddress'
url += f'?address={address}'
return None
if r.status_code != 200:
+ logger.debug(r.text)
logger.error('Unexpected response code %d, wanted 200. Fail.', r.status_code)
return None
- # print(json.dumps(r.json(), indent=4, sort_keys=True))
+ logger.debug('Response: %s', json.dumps(r.json(), indent=4, sort_keys=True))
return r.json()
-def batch_geocode_addresses(addresses: List[str]):
- """Send up to addresses for batch geocoding. Each line of the input
- list should be a single address of the form: STREET ADDRESS, CITY,
- STATE, ZIP. Components may be omitted but the commas may not be.
- Result is an array of the same size as the input array with one
- answer record per line. Returns None on error.
+def batch_geocode_addresses(addresses: List[str]) -> Optional[List[str]]:
+ """Send a list of addresses for batch geocoding to a web service
+ operated by the US Census Bureau.
- This code will deal with requests >10k addresses by chunking them
- internally because the census website disallows requests > 10k lines.
+ Args:
+ addresses: a list of addresses to geocode. Each line of the
+ input list should be a single address in the form: "STREET
+ ADDRESS, CITY, STATE, ZIPCODE". Individual address components
+ may be omitted and the service will make educated guesses but
+ the commas delimiters between address components may not be
+ omitted.
+
+ Returns:
+ An array of the same size as the input array with one
+ answer record per line. Returns None on error.
+
+ Note: this code will deal with requests >10k addresses by chunking
+ them internally because the census website disallows requests >
+ 10k lines.
>>> batch_geocode_addresses(
... [
... '700 Pennsylvania Avenue NW, Washington, DC, 20408',
... ]
... )
- ['"1"," 4600 Silver Hill Rd, Washington, DC, 20233","Match","Exact","4600 SILVER HILL RD, WASHINGTON, DC, 20233","-76.92743,38.84599","76355984","L","24","033","802405","2004"', '"2"," 935 Pennsylvania Avenue, NW, Washington, DC","No_Match"', '"3"," 1600 Pennsylvania Avenue NW, Washington, DC, 20500","Match","Exact","1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500","-77.03534,38.898754","76225813","L","11","001","980000","1034"', '"4"," 700 Pennsylvania Avenue NW, Washington, DC, 20408","Match","Exact","700 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20408","-77.02304,38.89362","76226346","L","11","001","980000","1025"']
+ ['"1"," 4600 Silver Hill Rd, Washington, DC, 20233","Match","Exact","4600 SILVER HILL RD, WASHINGTON, DC, 20233","-76.92743285599994,38.84598908100003","76355984","L","24","033","802405","2004"', '"2"," 935 Pennsylvania Avenue, NW, Washington, DC","No_Match"', '"3"," 1600 Pennsylvania Avenue NW, Washington, DC, 20500","Match","Exact","1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500","-77.03534009999998,38.89875363300007","76225813","L","11","001","980000","1034"', '"4"," 700 Pennsylvania Avenue NW, Washington, DC, 20408","Match","Exact","700 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20408","-77.02304089899997,38.89361872300003","76226346","L","11","001","980000","1025"']
"""
n = 1
except Exception as e:
logger.exception(e)
return None
+
if r.status_code != 200:
- print(r.text)
+ logger.debug(r.text)
logger.error('Unexpected response code %d, wanted 200. Fail.', r.status_code)
return None
+ logger.debug('Response: %s', r.text)
for line in r.text.split('\n'):
line = line.strip()
if len(line) > 0:
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