How to calculate the midpoint of several geolocations in python

问题

Is there's a library or a way to calculate the center point for several geolocations points? This is my list of geolocations based in New York and want to find the approximate midpoint geolocation

L = [
     (-74.2813611,40.8752222),
     (-73.4134167,40.7287778),
     (-74.3145014,40.9475244),
     (-74.2445833,40.6174444),
     (-74.4148889,40.7993333),
     (-73.7789256,40.6397511)
    ]

回答1:

After the comments I received and comment from HERE

With coordinates that close to each other, you can treat the Earth as being locally flat and simply find the centroid as though they were planar coordinates. Then you would simply take the average of the latitudes and the average of the longitudes to find the latitude and longitude of the centroid.

lat = []
long = []
for l in L :
  lat.append(l[0])
  long.append(l[1])

sum(lat)/len(lat)
sum(long)/len(long)

-74.07461283333332, 40.76800886666667

回答2:

Based on: https://gist.github.com/tlhunter/0ea604b77775b3e7d7d25ea0f70a23eb

Assume you have a pandas DataFrame with latitude and longitude columns, the next code will return a dictionary with the mean coordinates.

import math

x = 0.0
y = 0.0
z = 0.0

for i, coord in coords_df.iterrows():
    latitude = math.radians(coord.latitude)
    longitude = math.radians(coord.longitude)

    x += math.cos(latitude) * math.cos(longitude)
    y += math.cos(latitude) * math.sin(longitude)
    z += math.sin(latitude)

total = len(coords_df)

x = x / total
y = y / total
z = z / total

central_longitude = math.atan2(y, x)
central_square_root = math.sqrt(x * x + y * y)
central_latitude = math.atan2(z, central_square_root)

mean_location = {
    'latitude': math.degrees(central_latitude),
    'longitude': math.degrees(central_longitude)
    }

回答3:

Considering that you are using signed degrees format (more), simple averaging of latitude and longitudes would create problems for even small regions near to antimeridian (i.e. + or - 180-degree longitude) due to discontinuity of longitude value at this line (sudden jump between -180 to 180).

Consider two locations whose longitudes are -179 and 179, their mean would be 0, which is wrong.

来源：https://stackoverflow.com/questions/37885798/how-to-calculate-the-midpoint-of-several-geolocations-in-python

标签

python

geolocation

centering

ip-geolocation