TLDR

Question

我正在尝试关注Domino实验室的博客文章，使用Folium创建交互式犯罪地图。我发现代码库太旧了，无法运行Folium的Choropleth地图标记。虽然Domino平台上的旧版本似乎有用（2015），但最新的Ipython笔记本不起作用。所以我猜Folium改变了标记上的东西？我试图找到更新，但我找不到它。有人熟悉这个图书馆吗？如果是这样，请给我建议。

我的代码如下：

from IPython.display import HTML

def display(m, height=500):
    """Takes a folium instance and embed HTML."""
    m._build_map()
    srcdoc = m.HTML.replace('"', '&quot;')
    embed = HTML('<iframe srcdoc="{0}" '
                 'style="width: 100%; height: {1}px; '
                 'border: none"></iframe>'.format(srcdoc, height))
    return embed

import folium  
import pandas as pd

SF_COORDINATES = (37.76, -122.45)  
crimedata = pd.read_csv('data/SFPD_Incidents_-_Current_Year__2015_.csv')

#for speed purposes
MAX_RECORDS = 1000

#create empty map zoomed in on San Francisco
map = folium.Map(location=SF_COORDINATES, zoom_start=12)

#add a marker for every record in the filtered data, use a clustered view
for each in crimedata[0:MAX_RECORDS].iterrows():  
    map.simple_marker(
        location = [each[1]['Y'],each[1]['X']], 
        clustered_marker = True)

display(map)  

#definition of the boundaries in the map
district_geo = r'data/sfpddistricts.json'

#calculating total number of incidents per district
crimedata2 = pd.DataFrame(crimedata['PdDistrict'].value_counts().astype(float))  
crimedata2.to_json('data/crimeagg.json')  
crimedata2 = crimedata2.reset_index()  
crimedata2.columns = ['District', 'Number']

#creation of the choropleth
map1 = folium.Map(location=SF_COORDINATES, zoom_start=12)  
map1.geo_json(geo_path = district_geo,  
              data_out = 'data/crimeagg.json', 
              data = crimedata2,
              columns = ['District', 'Number'],
              key_on = 'feature.properties.DISTRICT',
              fill_color = 'YlOrRd', 
              fill_opacity = 0.7, 
              line_opacity = 0.2,
              legend_name = 'Number of incidents per district')

display(map1)

Answer 1

不确定你是指标记（弹出窗口）还是等值方法本身不起作用？

不推荐使用map1.geo_json()方法（请参阅How to respond with HTTP 400 error in a Spring MVC @ResponseBody method returning String?）。

相反，请尝试map1.choropleth(geo_path = district_geo, data_out = 'data/crimeagg.json', data = crimedata2, columns = ['District', 'Number'], key_on = 'feature.properties.DISTRICT', fill_color = 'YlOrRd', fill_opacity = 0.7, line_opacity = 0.2, legend_name = 'Number of incidents per district')

map.choropleth方法对我有用，但不知道他们是否修复了等值线图的弹出问题。希望这有帮助！

Answer 2

正在使用mapObject.choropleth方法。

根据以下github问题，建议使用

folium.GeoJson：https://github.com/python-visualization/folium/issues/589

在该问题中的注释链接到此示例，该示例显示了如何构建choropleth： http://nbviewer.jupyter.org/github/python-visualization/folium/blob/master/examples/GeoJSON_and_choropleth.ipynb?flush_cache=true

TLDR

将geo_json替换为GeoJson
，对于fill_color之类的参数，请在fillColor: <hex_color>字典kwarg中使用style_function。

Folium Choropleth地图标记不起作用

2 个答案:

TLDR