How to filter country from latitude and longitude?

Question

I have a CSV of 2 Million row. There only two columns Latitude and longitude. I want to filter a country. For example, I want to filter only india's lat and long.

Answer 1

There are two ways to find a country from lat longs ie Online and Offline. I'll explain both below:

Online

You need to install a package called geopy

pip install geopy

Following code will let you reverse geocode the latitude and longitude using OpenStreetMap geocoding web service

from geopy.geocoders import Nominatim
geolocator = Nominatim(user_agent="test_app")  # enter a name for your app
location = geolocator.reverse("27.1751, 78.0421")
print(location.raw['address']['country'])

However, it is not reliable.

Offline

A better option is to use offline geocoding using reverse-geocode

pip install reverse-geocode

Here's the sample code

import reverse_geocode
coords = (27.1751, 78.0421), (28.5245, 77.1855)
reverse_geocode.search(coords)