how to convert from longitude and latitude to country or city?

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爱一瞬间的悲伤
爱一瞬间的悲伤 2021-01-31 03:51

I need to convert longitude and latitude coordinates to either country or city, is there an example of this in python?

thanks in advance!

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5条回答
  • 2021-01-31 04:34

    This is called reverse geocoding. There is one library I could find in Python which is focused on this: https://github.com/thampiman/reverse-geocoder

    Some related questions with other ideas:

    • Offline Reverse Geocoding in Python
    • Reverse Geocoding Without Web Access
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  • 2021-01-31 04:37
    # Python3 program for reverse geocoding. 
    
    # importing necessary libraries 
    import reverse_geocoder as rg 
    from pandas import DataFrame
    import pandas as pd
    
    def reverseGeocode(coordinates): 
        result = rg.search(coordinates) 
        
        return result
    
        
    # Coorinates tuple.Can contain more than one pair. 
    
    if __name__ == "__main__":
        result = []
        path = "CSV_NAME.CSV"
        df = pd.read_csv(path, error_bad_lines=False)
        for i in range(0, len(df)):
            coordinates =(df["latitude"], df["longitude"]) 
            result.append(reverseGeocode(coordinates))
        print(result)
            
    
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  • 2021-01-31 04:51

    I use Google's API.

    from urllib2 import urlopen
    import json
    def getplace(lat, lon):
        url = "http://maps.googleapis.com/maps/api/geocode/json?"
        url += "latlng=%s,%s&sensor=false" % (lat, lon)
        v = urlopen(url).read()
        j = json.loads(v)
        components = j['results'][0]['address_components']
        country = town = None
        for c in components:
            if "country" in c['types']:
                country = c['long_name']
            if "postal_town" in c['types']:
                town = c['long_name']
        return town, country
    
    
    print(getplace(51.1, 0.1))
    print(getplace(51.2, 0.1))
    print(getplace(51.3, 0.1))
    

    Output:

    (u'Hartfield', u'United Kingdom')
    (u'Edenbridge', u'United Kingdom')
    (u'Sevenoaks', u'United Kingdom')
    
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  • 2021-01-31 04:56

    In general the Google API is the best approach. It was not suitable for my case as I had to process a lot of entries and the api is slow.

    I coded a small version that does the same but downloads a huge geometry first and computes the countries on the machine.

    import requests
    
    from shapely.geometry import mapping, shape
    from shapely.prepared import prep
    from shapely.geometry import Point
    
    
    data = requests.get("https://raw.githubusercontent.com/datasets/geo-countries/master/data/countries.geojson").json()
    
    countries = {}
    for feature in data["features"]:
        geom = feature["geometry"]
        country = feature["properties"]["ADMIN"]
        countries[country] = prep(shape(geom))
    
    print(len(countries))
    
    def get_country(lon, lat):
        point = Point(lon, lat)
        for country, geom in countries.iteritems():
            if geom.contains(point):
                return country
    
        return "unknown"
    
    print(get_country(10.0, 47.0))
    # Austria
    
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  • 2021-01-31 04:57

    Google has since depreciated keyless access to their API. Head over to google and register for a key, you get ~ 1,000 free queries a day. Code in accepted answer should be modified like this (can't add a comment, not enough rep).

    from urllib.request import urlopen
    import json
    
    def getplace(lat, lon):
        key = "yourkeyhere"
        url = "https://maps.googleapis.com/maps/api/geocode/json?"
        url += "latlng=%s,%s&sensor=false&key=%s" % (lat, lon, key)
        v = urlopen(url).read()
        j = json.loads(v)
        components = j['results'][0]['address_components']
        country = town = None
        for c in components:
            if "country" in c['types']:
                country = c['long_name']
            if "postal_town" in c['types']:
                town = c['long_name']
    
        return town, country
    
    print(getplace(51.1, 0.1))
    print(getplace(51.2, 0.1))
    print(getplace(51.3, 0.1))
    
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