Folium地图不显示邮政编码中的标记位置

Question

我得到了一个包含位置信息的.csv文件，任务是从邮政编码中检索纬度/经度。我执行了以下代码：

import postcodes_io_api
import pandas as pd
import folium

df = pd.read_csv(r'C:\Users\AUDIO-VISUAL\Desktop\MapPinpoint\RadioFibreSites.csv', 
                 encoding='ISO-8859-1')

api = postcodes_io_api.Api(debug_http=True)

for x in df["Postcode"]:
    data = api.get_postcode(x)
    latitude = [data["result"]["latitude"]]
    longitde = [data["result"]["longitude"]]

    m = folium.Map(location=[57.240618, -2.449411],
                  zoom_start = 12,
                  tiles='Stamen Terrain')

    for la, lon in zip([data["result"]["latitude"]], [data["result"]["longitude"]]):
        folium.Marker([la, lon], popup='<i>Mt. Hood Meadows</i>').add_to(m)

但是folium映射只显示文件中的最后一项，而不是一次显示所有项

Answer 1

我不能运行它，所以我会猜

所有的问题都是在循环内创建Map，然后为每个postcode创建新映射，并放置一个标记，在下一个循环中创建新映射而不使用以前的标记

只需在循环之前创建一次贴图

import postcodes_io_api
import pandas as pd
import folium

df = pd.read_csv(r'C:\Users\AUDIO-VISUAL\Desktop\MapPinpoint\RadioFibreSites.csv', encoding='ISO-8859-1')

api = postcodes_io_api.Api(debug_http=True)

# create map only once
m = folium.Map(location=[57.240618, -2.449411], 
                 zoom_start = 12,
                  tiles='Stamen Terrain')

# convert post and add to map
for postcode in df["Postcode"]:
    data = api.get_postcode(postcode)

    latitude = [data["result"]["latitude"]]
    longitde = [data["result"]["longitude"]]

    for la, lon in zip(latitude, longitde):
        folium.Marker([la, lon], popup='<i>Mt. Hood Meadows</i>').add_to(m)

# probably display map in Jupyter or IPython
m

---

顺便说一句：我不知道为什么你把数据放在[ ]里，然后你就用zip()了——这可能行得通

# convert post and add to map
for postcode in df["Postcode"]:
    data = api.get_postcode(postcode)

    lat = data["result"]["latitude"]
    lon = data["result"]["longitude"]

    folium.Marker([la, lon], popup='<i>Mt. Hood Meadows</i>').add_to(m)