我正在尝试在Dash中使用Choroplethmapbox
构建地图,但无法在其中绘图。
我使用其他工具测试geojson,在该工具中,地图绘制正确,但没有使用Choroplethmapbox
。
关于我在做什么错的任何想法?
谢谢
GeoJson:
https://gist.github.com/Tlaloc-Es/5c82834e5e4a9019a91123cb11f598c0
Python Dash代码:
import json
with open('mexico.geojson') as f:
counties = json.load(f)
fig = go.Figure(go.Choroplethmapbox(
geojson=counties,
locations=df['COV_'],
z=df['Enero'],
colorscale="Viridis", zmin=0, zmax=df['Enero'].max(),
marker_opacity=0.5, marker_line_width=0))
fig.update_layout(mapbox_style="carto-positron",
mapbox_zoom=3, mapbox_center = {"lat": 37.0902, "lon": -95.7129})
fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
看起来您似乎在底部缺少了fig.show(),而在顶部却没有了[[import plotly.graph_objects go]]。下面的代码将打开一个地图,但Choropleth值需要数据。您的代码示例中有df,但没有包含csv。如果需要我们代码中的df,请导入pandas,然后从csv创建一个名为df的数据框。这是一个可以帮助您的链接。 Pandas dataframesimport json
import plotly.graph_objects as go
with open(r'{insert file path here}.geojson') as f:
counties = json.load(f)
fig = go.Figure(go.Choroplethmapbox(
geojson=counties,
colorscale="Viridis", zmin=0, zmax=100,
marker_opacity=0.5, marker_line_width=0))
fig.update_layout(mapbox_style="carto-positron",
mapbox_zoom=3, mapbox_center = {"lat": 37.0902, "lon": -95.7129})
fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
fig.show()
这是在您的json上使用熊猫的示例。有关下面代码的进一步说明,请参见here
from urllib.request import urlopen
import json
with urlopen('https://raw.githubusercontent.com/plotly/datasets/master/geojson-counties-fips.json') as response:
counties = json.load(response)
import pandas as pd
df = pd.read_csv("https://raw.githubusercontent.com/plotly/datasets/master/fips-unemp-16.csv",
dtype={"fips": str})
import plotly.express as px
fig = px.choropleth(df, geojson=counties, locations='fips', color='unemp',
color_continuous_scale="Viridis",
range_color=(0, 12),
scope="usa",
labels={'unemp':'unemployment rate'}
)
fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
fig.show()