I'm attempting to use the Google Maps API with the GoogleMaps Python library to geocode latitude/longitude when provided with whole or part of an address (in this example, I'm using city/state, but I also have datasets with just zip codes that I'll need to use this for down the line).
import googlemaps
gmaps = googlemaps.Client(key=[insert API key here])
geocode_result = gmaps.geocode('Sacramento, CA')
print(geocode_result)
Result:[{u'geometry': {u'location_type': u'APPROXIMATE', u'bounds': {u'northeast': {u'lat': 38.685507, u'lng': -121.325705}, u'southwest': {u'lat': 38.437574, u'lng': -121.56012}}, u'viewport': {u'northeast': {u'lat': 38.685507, u'lng': -121.325705}, u'southwest': {u'lat': 38.437574, u'lng': -121.56012}}, u'location': {u'lat': 38.5815719, u'lng': -121.4943996}}, u'address_components': [{u'long_name': u'Sacramento', u'types': [u'locality', u'political'], u'short_name': u'Sacramento'}, {u'long_name': u'Sacramento County', u'types': [u'administrative_area_level_2', u'political'], u'short_name': u'Sacramento County'}, {u'long_name': u'California', u'types': [u'administrative_area_level_1', u'political'], u'short_name': u'CA'}, {u'long_name': u'United States', u'types': [u'country', u'political'], u'short_name': u'US'}], u'place_id': u'ChIJ-ZeDsnLGmoAR238ZdKpqH5I', u'formatted_address': u'Sacramento, CA, USA', u'types': [u'locality', u'political']}]
My issue is that I'm not sure how to extract the appropriate lat/lon values from this list. I've tried parsing through the list using the following code (taken from the answer to this question on SO):
import operator
thirditem=operator.itemgetter(3)(geocode_result)
print(thirditem)
When I run this, I get an IndexError saying the index is out of range. I've run it through the debugger also, but I get the same error without any additional information. I've googled around and looked through other SO questions, but i'm still not sure where the issue is.
As a side note, I've also tried to use the code examples in this tutorial, but I get a "0" as my answer when I try to run it, which is unfortunately even less helpful than an IndexError.
My goal is to be able to parse the appropriate lat/lon values from here and insert them dynamically into this basemap script. Values are currently hard-coded, but eventually I'd like to be able to use a variable for the values llcrnrlon, llcrnrlat, urcrnrlon, urcrnrlat, lat_0, and lon_0:
map = Basemap(projection='merc',
# with high resolution,
resolution= 'h',
# And threshold 100000
area_thresh = 100000.0,
# Centered on these coordinates
lat_0=37, lon_0=119,
#and using these corners to specify the lower left lon/lat and upper right lon/lat of the graph)
llcrnrlon=-130, llcrnrlat=30,
urcrnrlon=-110, urcrnrlat=45)
I'm SUPER new to all this, so there could be an easy answer that I'm just not seeing. Any help is welcome! Thanks.
I was able to ask some of my fellow devs for help, and I am answering my own question on here in the hopes that it will help others who are also struggling with the same problem.
Geocoded results return a JSON object, which in Python is treated like a dictionary that only contains a single object (the result). Therefore, in order to extract the appropriate lat-lon values, you need to use "geocode_result[0]["geometry"]["location"]["lat"]", with [0] being the first object in the array (the result).
I wrote this function to use in my Basemap script to extract the lat/lon values from a location passed in as a parameter.
def geocode_address(loc):
gmaps = googlemaps.Client(key=[insert your API key here])
geocode_result = gmaps.geocode(loc)
lat = geocode_result[0]["geometry"]["location"]["lat"]
lon = geocode_result[0]["geometry"]["location"]["lng"]
#test - print results
print (lat,lon)
When I test it out using Sacramento, CA as the loc:
geocode_address('Sacramento, CA')
This is my result:
Result: 38.5815719, -121.4943996