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import requests
import json
from urllib.parse import quote
import math
from typing import Union
from time import sleep
def get_geo_coords(address, access_token):
sleep_time = 1
while sleep_time < 10:
base_url = "https://us1.locationiq.com/v1/search"
# headers= {"key: " + f"{access_token}", "Content-Type: application/json",}
url = f"{base_url}?key={access_token}&q={quote(address)}&format=json"
response = requests.get(url)
if response.status_code != 200: # == 429:
sleep(sleep_time)
sleep_time *= 3
else:
break
if sleep_time > 9:
return (0.0, 0.0)
rjson = json.loads(response.content)
return (float(rjson[0]['lat']), float(rjson[0]['lon']))
Number = Union[int, float]
def great_circle_distance_miles(lat1: Number, lon1: Number, lat2: Number, lon2: Number,
radius_miles: float = 3958.8) -> float:
"""
Compute the great-circle distance between two points on the Earth using the haversine formula.
Parameters:
- lat1, lon1: Latitude and longitude of the first point in degrees.
- lat2, lon2: Latitude and longitude of the second point in degrees.
- radius_miles: Radius of the Earth in miles (default 3958.8 miles).
Returns:
- Distance between the two points in miles (float).
Notes:
- Latitude values should be in [-90, 90], longitude values in [-180, 180].
"""
# convert degrees to radians
phi1 = math.radians(lat1)
phi2 = math.radians(lat2)
dphi = math.radians(lat2 - lat1)
dlambda = math.radians(lon2 - lon1)
# haversine formula
a = math.sin(dphi / 2.0) ** 2 + math.cos(phi1) * math.cos(phi2) * math.sin(dlambda / 2.0) ** 2
c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
return radius_miles * c
# Example:
# Distance from New York City (40.7128° N, -74.0060° W)
# to Los Angeles (34.0522° N, -118.2437° W)
# if __name__ == "__main__":
# ny_lat, ny_lon = 40.7128, -74.0060
# la_lat, la_lon = 34.0522, -118.2437
# print(f"NYC -> LA: {great_circle_distance_miles(ny_lat, ny_lon, la_lat, la_lon):.1f} miles")
# if __name__ == "__main__":
# address = 'Grytviken, South Georgia' #'Rio de Janerio, Argentina'
# (lat, lon) = get_geo_coords(address) #'307 Pauly Drive, Englewood, Ohio, USA')
# print(f'{address}: Lat = {float(lat):.2f}, Lon = {float(lon):.2f}')
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