How does one add geojson polygons colored by a chose feature? For example, a county boundary map that is filled in shaded according to population density. I want to achieve this with the seaborn palette. May I please get some guidance?

@encyclopediabrown With a seaborn palette you should define a discrete colorscale. This means that your geographical feature encoded by numerical values between [vmin, vmax] should be divided in a few categories (intervals), and each value in an interval will be mapped to a color in the chosen pal…

You could use either Plotly, [image] Choropleth Maps How to make choropleth maps in Python with Plotly. Or Dash Leaflet, https://dash-leaflet.herokuapp.com/#us_states

Thanks you @empet , I tried using that method but now I am not getting anything on the map without any errors [image] [image]

@empet Also, something might be wrong with your function that it creates two colors for the same number. Is that why nothing is showing up? [image]

@encyclopediabrown This is a typical definition of a discrete colorscale with repeating inner values of the scale. If they are non-repeating plotly.js interpolates the colors and you’ll not get a colorbar that shows the sns colors. Your choroplethmapbox is empty because something is wrong in its…

Thanks @empet , I was able to get it to plot. The problem now is that this creates an entire different map. I wanted to overlay as a layer this cholorpleth geojson over a scattermapbox i already have plotted . Is there a way to make this work with what I have or is it an entirely different process?…

It works fine when you add the two in an jupyter notebook but when I put it in dash it breaks. I have trace1= scattermapbox() trace2 = choroplethmapbox() layout = go.Layout() … return go.Figure( data=[trace1, trace2], layout=layout ) then it spits out my geojson like this… }),)] T…

@encyclopediabrown define first: fig = go.Figure(go.Scattermapbox(...)) #and then: fig.add_choroplethmapbox(...)

Thank You! this worked out fine! I really appreciate the help.

Add geojson polygons seaborn colored by specific feature

Dash Python

Emil June 2, 2020, 6:32pm 2

You could use either Plotly,

Or Dash Leaflet,

https://dash-leaflet.herokuapp.com/#us_states

Choropleth map for european country?

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Add geojson polygons seaborn colored by specific feature

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