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amites/center_geo.py

Last active October 15, 2021 23:14
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Center Geolocations
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center_geo.py
from math import cos, sin, atan2, sqrt
def center_geolocation(geolocations):
"""
Provide a relatively accurate center lat, lon returned as a list pair, given
a list of list pairs.
ex: in: geolocations = ((lat1,lon1), (lat2,lon2),)
out: (center_lat, center_lon)
"""
x = 0
y = 0
z = 0
for lat, lon in geolocations:
lat = float(lat)
lon = float(lon)
x += cos(lat) * cos(lon)
y += cos(lat) * sin(lon)
z += sin(lat)
x = float(x / len(geolocations))
y = float(y / len(geolocations))
z = float(z / len(geolocations))
return (atan2(z, sqrt(x * x + y * y)), atan2(y, x))
@Firzen7
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Firzen7 commented Mar 3, 2020

@AdamEyreWalker I am not sure, because I haven't programmed anything :D Steps I did:

  1. Select contents of center_geo.py
  2. Go to https://repl.it/languages/python3
  3. Paste source code in the editor
  4. Click run
  5. Input center_geolocation([(56.012, -3.61), (56.016, -3.62)]) in the console
  6. Press ENTER

As I said, I didn't change anything. :-)

@AdamEyreWalker
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AdamEyreWalker commented Mar 3, 2020 via email

@JamesGDiaz
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@AdamEyreWalker @Firzen7 You have to convert to radians first, this funcion assumes input is in radians:
lat_rad = latPi/180
lon_rad = lonPi/180

just convert it back to degrees at the end

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