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November 16, 2016 21:10
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more generic version of mapzen-geocoder in python, used to get city locations in the U.S. https://mapzen.com/documentation/search/
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| from csv import DictReader, DictWriter | |
| from os import environ | |
| from time import sleep | |
| import requests | |
| FNAME = 'mx-syria.csv' | |
| ONAME = FNAME + 'geocoded.csv' | |
| API_KEY = environ['MAPZEN_SEARCH_KEY'] | |
| BASE_URL = 'https://search.mapzen.com/v1/search' | |
| def foo_geocode(address_text, country = 'USA'): | |
| resp = requests.get(BASE_URL, | |
| params = {'api_key': API_KEY, 'size': 1, | |
| 'text': address_text, 'boundary.country': country}) | |
| data = resp.json() | |
| bbox = data['bbox'] | |
| pt = {} | |
| pt['lat'] = (bbox[1] + bbox[3]) / 2 | |
| pt['lon'] = (bbox[0] + bbox[2]) / 2 | |
| return pt | |
| r = open(FNAME) | |
| rcsv = DictReader(r) | |
| w = open(ONAME, 'w') | |
| wcsv = DictWriter(w, fieldnames = rcsv.fieldnames + ['latitude', 'longitude']) | |
| wcsv.writeheader() | |
| for row in rcsv: | |
| addr = "%s, %s, U.S." % (row['City'], row['Destination State']) | |
| try: | |
| pt = foo_geocode(addr) | |
| except Exception as err: | |
| print(addr) | |
| print("\tError:", err) | |
| else: | |
| print(addr, pt['lat'], pt['lon']) | |
| row['latitude'] = pt['lat'] | |
| row['longitude'] = pt['lon'] | |
| wcsv.writerow(row) | |
| sleep(0.2) | |
| w.close() | |
| r.close() |
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