Lets say I have 2 kind of coordinate, first called center_point and second called test_point. I want to know if test_point coordinate is inside near or not to center_point coordinate by applying radius threshold. If I write it, its like:
center_point = [{'lat': -7.7940023, 'lng': 110.3656535}]
test_point = [{'lat': -7.79457, 'lng': 110.36563}]
radius = 5 # in kilometer
How to check if the test_point inside or outside the radius from center_point in Python? how I perform this kind task in Python?
Result expected will say that test_point inside or outside the radius from center_point coordinate.
from recommendation of @user1753919 in his/her comment, I got the answer here: Haversine Formula in Python (Bearing and Distance between two GPS points)
final code:
from math import radians, cos, sin, asin, sqrt
def haversine(lon1, lat1, lon2, lat2):
"""
Calculate the great circle distance between two points
on the earth (specified in decimal degrees)
"""
# convert decimal degrees to radians
lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
# haversine formula
dlon = lon2 - lon1
dlat = lat2 - lat1
a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2
c = 2 * asin(sqrt(a))
r = 6371 # Radius of earth in kilometers. Use 3956 for miles
return c * r
center_point = [{'lat': -7.7940023, 'lng': 110.3656535}]
test_point = [{'lat': -7.79457, 'lng': 110.36563}]
lat1 = center_point[0]['lat']
lon1 = center_point[0]['lng']
lat2 = test_point[0]['lat']
lon2 = test_point[0]['lng']
radius = 1.00 # in kilometer
a = haversine(lon1, lat1, lon2, lat2)
print('Distance (km) : ', a)
if a <= radius:
print('Inside the area')
else:
print('Outside the area')
Thanks
GeoPy can handle it gracefully:
from geopy import distance
center_point = [{'lat': -7.7940023, 'lng': 110.3656535}]
test_point = [{'lat': -7.79457, 'lng': 110.36563}]
radius = 5 # in kilometer
center_point_tuple = tuple(center_point[0].values()) # (-7.7940023, 110.3656535)
test_point_tuple = tuple(test_point[0].values()) # (-7.79457, 110.36563)
dis = distance.distance(center_point_tuple, test_point_tuple).km
print("Distance: {}".format(dis)) # Distance: 0.0628380925748918
if dis <= radius:
print("{} point is inside the {} km radius from {} coordinate".format(test_point_tuple, radius, center_point_tuple))
else:
print("{} point is outside the {} km radius from {} coordinate".format(test_point_tuple, radius, center_point_tuple))
or if you need to know the great circle distance:
dis = distance.great_circle(center_point_tuple, test_point_tuple).km
print("Distance: {}".format(dis)) # Distance: 0.0631785164583489
from math import sqrt
a = center_point[0]['lat'] - test_point[0]['lat']
b = center_point[0]['lng'] - test_point[0]['lng']
c = sqrt(a * a + b * b)
if (c < radius):
print("inside")
else:
print("outside")