[gentile]

Some more context for Japan's land use (it does not differ prefecturally; some local regulations like kyoto and building colors)

The basics of Japan's Land use rules in english (only 8 pages; mostly tables/pictures and very straightforward): https://www.mlit.go.jp/common/001050453.pdf

- In the "Control of Building Use by Land Use Zones" you can see how even the most exclusive of zoning enables "Houses with other small scale function", Clinics, Schools or stores with very small footprints.

- Structures are restricted by the shape, shadow, and floor area.

- No mention of "single-family" housing.

A map (of Tokyo) overlaying the gradient of zoning from least to most permissive. You can see how the up-zoning follows the major roads: https://tokyochizu.github.io/zoning.html

[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.