使用距离矩阵在Python中计算经纬度点之间的距离

Question

I am trying to calculate the distances between points by using gmaps.distance_matrix() with a google api. The code outputs unreasonable results, but I can't find where the error is.

Here is my code:

gmaps = googlemaps.Client(key=API_key)
origins = ['41.844775, -87.626719', '41.614779, -87.55133599999999', '41.567222, -87.550503', '41.800635, -87.604568', '41.69154, -87.62171', '41.894244, -87.62284100000001', '42.010228000000005, -72.840536', '42.010228000000005, -72.840536', '42.010228000000005, -72.840536', '42.010228000000005, -72.840536', '47.617177000000005, -122.208579']

destinations = ['41.614779, -87.55133599999999', '41.567222, -87.550503', '41.800635, -87.604568', '41.69154, -87.62171', '41.894244, -87.62284100000001', '42.010228000000005, -72.840536', '42.010228000000005, -72.840536', '42.010228000000005, -72.840536', '42.010228000000005, -72.840536', '47.617177000000005, -122.208579', '41.894244, -87.62284100000001']

actual_distance_testing = []

for origin, destination in zip(origins, destinations):
        result = gmaps.distance_matrix(origin, destinations, mode='driving')["rows"][0]["elements"][0]["distance"]["value"]  
        result = result/1000
        actual_distance_testing.append(result)

print(actual_distance_testing)

This is the output I got from the code above:

[31.716, 0.0, 7.257, 28.524, 13.981, 39.688, 1416.856, 1416.856, 1416.856, 1416.856, 3347.006]

The first value is correct, but the rest of them are not accurate. This is my expected and correct result:

[31.716, 7.247, 33.71, 14.976, 25.557, .....]

For more information: I am calculating the distance in km. For example, the distance between '41.844775, -87.626719' and '41.614779, -87.55133599999999' is 31.716 km.

I tried to calculate the second value only, and the output is correct if I do the calculation separately as followed:

o = (41.614779, -87.55133599999999); d = (41.567222, -87.550503)
result = gmaps.distance_matrix(o, d, mode='driving')["rows"][0]["elements"][0]["distance"]["value"]/1000

print(result)

7.247

Answer 1

here I think you should look at the full response to understand how Google API provides the requested query. I recommend for you to trace the response first.

result['rows'][0]['elements']= [{'distance': {'text': '31.7 km', 'value': 31715}, 'duration': {'text': '26 mins', 'value': 1568}, 'status': 'OK'}]