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geo_lookup.py
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geo_lookup.py
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import csv
import io
import requests
from additional_data.models import GeoLookup
class GeoLookupSource(object):
"""Imports geographical lookups from https://github.com/drkane/geo-lookups/
These allow for looking up from lower-level geography like Ward to a standard local authority, region, etc"""
# Source URLS
SOURCE_URLS = {
"lsoa": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/lsoa_la.csv",
"url_latlong": "https://raw.githubusercontent.com/drkane/geo-lookups/master/lsoa_latlong.csv",
"field_areacode": "lsoa11cd",
"field_areaname": "lsoa11nm",
"field_transforms": {
"lad20cd": "ladcd",
"lad20nm": "ladnm",
},
},
"msoa": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/msoa_la.csv",
"url_latlong": "https://raw.githubusercontent.com/drkane/geo-lookups/master/msoa_latlong.csv",
"field_areacode": "msoa11cd",
"field_areaname": "msoa11hclnm",
"field_transforms": {
"lad20cd": "ladcd",
"lad20nm": "ladnm",
},
},
"ward": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/ward_all_codes.csv",
"url_latlong": "https://raw.githubusercontent.com/drkane/geo-lookups/master/ward_latlong.csv",
"field_areacode": "wdcd",
"field_areaname": "wdnm",
},
"la": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/la_all_codes.csv",
"field_areacode": "ladcd",
"field_areaname": "ladnm",
"field_transforms": {
"lad20cd": "ladcd",
"lad20nm": "ladnm",
},
},
"rgn": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/rgn_all_codes.csv",
"field_areacode": "rgncd",
"field_areaname": "rgnnm",
},
"ctry": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/ctry_all_codes.csv",
"field_areacode": "ctrycd",
"field_areaname": "ctrynm",
},
"utla": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/utla_all_codes.csv",
"field_areacode": "utlacd",
"field_areaname": "utlanm",
},
"cuath": {
"url_lookup": "https://raw.githubusercontent.com/drkane/geo-lookups/master/cauth_all_codes.csv",
"field_areacode": "cauthcd",
"field_areaname": "cauthnm",
},
}
def __init__(self):
pass
def get_lookup_data(self, areatype, areadata, areas):
def clean_fields(row):
for field, value in row.items():
field = field.lower()
if field == areadata.get("field_areacode"):
field = "areacode"
if field == areadata.get("field_areaname"):
field = "areaname"
if areadata.get("field_transforms", {}).get(field):
field = areadata.get("field_transforms", {}).get(field)
yield field, value
r = requests.get(areadata.get("url_lookup"), stream=True)
r.encoding = "utf-8-sig"
area_csv = io.StringIO(r.text)
reader = csv.DictReader(area_csv)
for r in reader:
data = dict(clean_fields(r))
data["areatype"] = areatype
if data["areacode"] not in areas:
areas[data["areacode"]] = data
if areadata.get("url_latlong"):
r = requests.get(areadata.get("url_latlong"), stream=True)
r.encoding = "utf-8-sig"
area_csv = io.StringIO(r.text)
reader = csv.DictReader(area_csv)
for r in reader:
data = dict(clean_fields(r))
areas[data["areacode"]]["latitude"] = float(data["latitude"])
areas[data["areacode"]]["longitude"] = float(data["longitude"])
return areas
def import_geo_lookups(self, urls=SOURCE_URLS):
data = {}
for areatype, areadata in urls.items():
print("fetching {}".format(areatype))
data = self.get_lookup_data(areatype, areadata, data)
if GeoLookup.objects.exists():
GeoLookup.objects.all().delete()
GeoLookup.objects.bulk_create(
[
GeoLookup(areacode=areacode, areatype=d["areatype"], data=d)
for areacode, d in data.items()
]
)
def get_area_by_code(self, areacode):
try:
area = GeoLookup.objects.get(areacode=areacode)
return area.data
except GeoLookup.DoesNotExist:
pass
def update_additional_data(self, grant, additional_data):
"""Updates with 'locationLookup' based on available areas."""
additional_data["locationLookup"] = []
for location in grant.get("beneficiaryLocation", []):
if location.get("geoCode"):
area = self.get_area_by_code(location.get("geoCode"))
if area:
area["source"] = "beneficiaryLocation"
area["sourceCode"] = location.get("geoCode")
additional_data["locationLookup"].append(area)
if additional_data["locationLookup"]:
# if we've found data then return
return
for recipient in grant.get("recipientOrganization", []):
for location in recipient.get("location", []):
if location.get("geoCode"):
area = self.get_area_by_code(location.get("geoCode"))
if area:
area["source"] = "recipientOrganizationLocation"
area["sourceCode"] = location.get("geoCode")
additional_data["locationLookup"].append(area)
if additional_data["locationLookup"]:
# if we've found data then return
return
lsoa = additional_data.get("recipientOrganizationLocation", {}).get("lsoa11")
if lsoa:
area = self.get_area_by_code(lsoa)
if area:
area["source"] = "recipientOrganizationPostcode"
area["sourceCode"] = lsoa
additional_data["locationLookup"].append(area)