Osaka in context: Street-network sprawl trends

Osaka in context

22.42.83.2<19751976–19901991–20052006–2020SNDi of street additions
22.42.83.2<19751976–19901991–20052006–2020SNDi of entire street network
OsakaJapan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Osaka plotted against Japan. The SNDi of new construction in Osaka peaked in 1976-1990, while Japan followed a zig-zag trend with an overall increase. Most recently, Osaka's incremental SNDi fell from 3.18 to 3.07 between 1991-2005 and 2006-2020. In terms of the aggregate network, Osaka ranked 64th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
3.07
Rank in Japan
91st of 135

Entire Network (Aggregate)

SNDi value
2.24
Rank in Japan
64th of 135

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

1.21.82.43<19751976–19901991–20052006–2020SNDi of street additions
1.21.82.43<19751976–19901991–20052006–2020SNDi of entire street network
OsakaIstanbulBuenos Aires

In new street additions, Osaka built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Istanbul fluctuated in its street-construction patterns and Buenos Aires built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Osaka and Istanbul have been converging in their street-network character since 1975.