# Is it possible to use custom GeoJson on go.Choropleth not plotly Express
**URL:** https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819
**Category:** 📊 Plotly Python
**Created:** [March 28, 2020, 10:53am UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819 "2020-03-28T10:53:09Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@fbosler](https://community.plotly.com/u/fbosler)
#### Post date: [March 28, 2020, 10:53am UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/1 "2020-03-28T10:53:09Z")
I have built a dash app where I am plotting German Districts. Find Repo [here](https://github.com/FBosler/covid19-dash-app).
However, I need log scales (for the colors) and want to overwrite the hover box with actual numbers. I get the feeling this would be easier done with the old Plotly.
Current Visualization:
Ideally what I want to do is to have a visualization like [here](https://mfreeborn.github.io/blog/2020/03/15/interactive-coronavirus-map-with-jupyter-notebook) on a German level:
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### Author:  [@Emmanuelle](https://community.plotly.com/u/Emmanuelle)
#### Post date: [March 28, 2020, 11:07am UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/2 "2020-03-28T11:07:44Z")
Hi @fbosler, two answers to your question 🙂
- yes, the `go.Choropleth` trace has `geojson` and `featureidkey` attributes which you can use as in the `px` function, see [https://plotly.com/python-api-reference/generated/plotly.graph\_objects.Choropleth.html](https://plotly.com/python-api-reference/generated/plotly.graph_objects.Choropleth.html) for the API documentation
- that said, you can also pass to `px.choropleth` the log of the values in the `color` argument of `px.choropleth`, and modify the hovertemplate to your taste using `fig.update_traces`. You can also tune the ticks of the colorbar, or just use a prefix like what is one [here](https://github.com/covid19-dash/covid-dashboard/blob/master/make_figures.py#L48), corresponding to [this dashboard](https://covid19-dash.github.io/)
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### Author:  [@fbosler](https://community.plotly.com/u/fbosler)
#### Post date: [March 28, 2020, 12:01pm UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/3 "2020-03-28T12:01:30Z")
Hi @Emmanuelle ! thx for the reply. Amazing dashboard btw. did you code it yourself?
How did you deploy it? For ease of use, I deployed mine via AWS/serverless. But it’s super slow and I am running into payload size restrictions now.
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### Author:  [@Emmanuelle](https://community.plotly.com/u/Emmanuelle)
#### Post date: [March 28, 2020, 1:19pm UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/4 "2020-03-28T13:19:12Z")
if the callbacks are slow you can try to write them as client-side callbacks (see [https://dash.plotly.com/performance](https://dash.plotly.com/performance) for more details). For this specific dashboard we wrote everything with client-side callbacks (and we also transformed the app into static html pages because we wanted to host it under Github pages but this is very hacky I would not recommend it).
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### Author:  [@fbosler](https://community.plotly.com/u/fbosler)
#### Post date: [March 28, 2020, 2:28pm UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/5 "2020-03-28T14:28:57Z")
Heya Emmanuelle,
not it seems like my provided geojson doesn’t do anything (as in a sense, that it still shows the world map). Where am I going wrong here?
```auto
## imports
from urllib.request import urlopen
import pandas as pd
import plotly.graph_objects as go
df = pd.read_csv('https://raw.githubusercontent.com/FBosler/covid19-dash-app/master/functions/data.csv')
def fetch_counties():
URL = "https://raw.githubusercontent.com/FBosler/covid19-dash-app/master/functions/counties.json"
with urlopen(URL) as response:
counties = json.load(response)
return counties
counties = fetch_counties()
fig = go.Figure(data=go.Choropleth(
geojson=counties,
locations = df[df['infected'] != 0]['Landkreis'],
featureidkey="properties.NAME_3"
))
fig.show()
```
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### Author:  [@fbosler](https://community.plotly.com/u/fbosler)
#### Post date: [March 29, 2020, 10:34am UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/6 "2020-03-29T10:34:01Z")
@Emmanuelle Could you give me a pointer how to make the Choropleth work with regions that is not the US? Would be really appreciated.
Cheers
---
### Author:  [@Emmanuelle](https://community.plotly.com/u/Emmanuelle)
#### Post date: [March 29, 2020, 1:38pm UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/7 "2020-03-29T13:38:08Z")
Hi @fbosler it does not work because you did not pass which information should be color-coded. Below are two working examples, one with `go.Choropleth` and the other one with `px.choropleth`.
```auto
from urllib.request import urlopen
import pandas as pd
import numpy as np
import json
import plotly.graph_objects as go
df = pd.read_csv('https://raw.githubusercontent.com/FBosler/covid19-dash-app/master/functions/data.csv')
def fetch_counties():
URL = "https://raw.githubusercontent.com/FBosler/covid19-dash-app/master/functions/counties.json"
with urlopen(URL) as response:
counties = json.load(response)
return counties
counties = fetch_counties()
fig = go.Figure(data=go.Choropleth(
geojson=counties,
z=np.log10(df['infected']),
locations = df['Landkreis'],
featureidkey="properties.NAME_3"
))
fig.update_geos(fitbounds="locations")
fig.show()
```
or
```auto
import plotly.express as px
import numpy as np
fig = px.choropleth(df, geojson=counties, locations='Landkreis',
color=np.log10(df['infected']),
featureidkey="properties.NAME_3")
fig.update_geos(fitbounds="locations")
fig.show()
```
---
### Author:  [@fbosler](https://community.plotly.com/u/fbosler)
#### Post date: [March 29, 2020, 2:29pm UTC](https://community.plotly.com/t/is-it-possible-to-use-custom-geojson-on-go-choropleth-not-plotly-express/36819/8 "2020-03-29T14:29:03Z")
> [@Emmanuelle](#):
>
> z=np.log10(df[‘infected’]),
Ahhh, you are amazing, really appreciate the help!
Cheers
Fabian