[edale]

Houston made me LOL.

These maps are really interesting. The LA one made me think of the thread that discussed whether LA was urban. You can clearly see there are many nodes that are walkable, but the city largely lacks a large, contiguous area of greens and blues. Having such a contiguous area directly translates into how urban an area feels, I think. Contrast LA's map to San Francisco's and you can see why lots of people think that SF feels more urban than LA.