The best solution I found was using the one described in https://community.plotly.com/t/choropleth-map-in-dash/4807/2.
This is far from ideal because I have to plot the center points on top of each of the polygons and set the opacity to zero to have some some hoverinfo interactions. This means that the plot becomes twice as heavy and slow when plotting a large grid. It is yet much faster than plotting the contours and has the advantage to allow area filling.
1 Like