[throwaway2037]

Your last link of zoning density is incredibly cool. Did you create it?

[gentile]

Yes, it just uses the shapefile from the tokyo open data site.

https://catalog.data.metro.tokyo.lg.jp/dataset/t000008d00000...

It's a quarto site so if you navigate to the repository of the github page you can see the python code used to generate the map/choropleth.