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# utils.py
import numpy as np
from config import EARTH_RADIUS_KM
def deg_to_rad(degrees):
return degrees * (np.pi / 180)
def distcalculate(lat1, lon1, lat2, lon2):
d_lat = deg_to_rad(lat2 - lat1)
d_lon = deg_to_rad(lon2 - lon1)
a = np.sin(d_lat / 2)**2 + np.cos(deg_to_rad(lat1)) * np.cos(deg_to_rad(lat2)) * np.sin(d_lon / 2)**2
c = 2 * np.arctan2(np.sqrt(a), np.sqrt(1 - a))
return EARTH_RADIUS_KM * c
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