python - 我可以在 Python 中使用 geopy 获得海拔高度吗？（带经度/纬度）

Question

有可能的？

我试过：

from geopy.point import Point
from geopy import geocoders
[...]
p = Point(Latitude, Longitude)
lat, lon, altitude = p
height_metres = altitude

但 height_metres 始终为 0。

Answer 1

请注意，使用地理编码器，您将需要一个 Google 海拔 API 密钥，该密钥现在需要一个启用计费的项目（截至 2018 年 7 月）。

作为替代方案，您可以使用开放式高程公共 API。这是一个返回海拔的示例函数（注意用于字符串格式化的python 3.6）：

import requests
import pandas as pd

# script for returning elevation from lat, long, based on open elevation data
# which in turn is based on SRTM
def get_elevation(lat, long):
    query = ('https://api.open-elevation.com/api/v1/lookup'
             f'?locations={lat},{long}')
    r = requests.get(query).json()  # json object, various ways you can extract value
    # one approach is to use pandas json functionality:
    elevation = pd.io.json.json_normalize(r, 'results')['elevation'].values[0]
    return elevation

请注意，API 将来可能会发生变化，我无法评论数据的真实性，但目前它是 Google 的一个不错的替代品，抽查表明它运行良好。

Answer 2

使用地理编码器而不使用geopy是可能的：

# pip install geocoder
>>> import geocoder
>>> g = geocoder.elevation('<address or [lat,lng]>')
>>> print (g.meters)

Answer 3

I would eat my socks if geopy knew the altitude of every single point on the globe. This isn't possible (afaik) without doing some fancy GoogleEarth/other database searching to figure out the altitude.

The reason why lat, lon, altitude = p works is because the Point has an altitude attribute. According to the source, the only time in the constructor altitude is altered is in the line altitude = float(altitude or 0), which doesn't get the altitude.