使用 Python 从经纬度识别美国县

Question

I am using the codes below to identify US county. The data is taken from Yelp which provides lat/lon coordinate.

id	latitude	longitude
1	40.017544	-105.283348
2	45.588906	-122.593331

import pandas
df = pandas.read_json("/Users/yelp/yelp_academic_dataset_business.json", lines=True, encoding='utf-8')

# Identify county
from geopy.geocoders import Nominatim
geolocator = Nominatim(user_agent="http")
df['county'] = geolocator.reverse(df['latitude'],df['longitude'])

The error was "TypeError: reverse() takes 2 positional arguments but 3 were given".

Answer 1

Nominatim.reverse takes coordinate pairs; the issue is that you are passing it pandas dataframe columns. df['latitude'] here refers to the entire column in your data, not just one value, and since geopy is independent of pandas , it doesn't support processing an entire column and instead just sees that the input isn't a valid number.

Instead, try looping through the rows:

county = []

for row in range(len(df)):
    county.append(geolocator.reverse((df['latitude'][row], df['longitude'][row])))

(Note the double brackets.)

Then, insert the column into the dataframe:

df.insert(index, 'county', county, True)

( index should be what column position you want, and the boolean value at the end indicates that duplicate values are allowed.)