I think just looking at the road network gives you fairly nice, clearly delineated areas.
Paris has got this concept of intra-muros (within the walls) and extra-muros and the limit of this area is the ring road around it. And if you look at your favourite map software you can see the 10km wide circle clear as day. Then one other ring further out (about 20km wide), then a third about 40km wide, a bit more patchy, the circle isn’t perfect or complete, but still the area is clear enough.
I believe you can see this growth ring structure too, if you look at London and probably a lot of other historic cities.
I think just looking at the road network gives you fairly nice, clearly delineated areas.
Paris has got this concept of intra-muros (within the walls) and extra-muros and the limit of this area is the ring road around it. And if you look at your favourite map software you can see the 10km wide circle clear as day. Then one other ring further out (about 20km wide), then a third about 40km wide, a bit more patchy, the circle isn’t perfect or complete, but still the area is clear enough.
I believe you can see this growth ring structure too, if you look at London and probably a lot of other historic cities.