Otsu in context: Street-network sprawl trends

Otsu in context

2.12.42.73<19751976–19901991–20052006–2020SNDi of street additions
2.12.42.73<19751976–19901991–20052006–2020SNDi of entire street network
OtsuShiga (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Otsu plotted against Shiga and Japan. The SNDi of new construction in Otsu peaked in 1976-1990, compared to Shiga which followed a zig-zag trend with an overall increase and Japan which followed a zig-zag trend with an overall increase. Most recently, Otsu's incremental SNDi fell from 2.9 to 2.6 between 1991-2005 and 2006-2020. In terms of the aggregate network, Otsu ranked 4th out of 4 cities in Shiga and 101st out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.6
Rank in Japan
67th of 135
Rank in Shiga
2nd of 4

Entire Network (Aggregate)

SNDi value
2.67
Rank in Japan
101st of 135
Rank in Shiga
4th of 4

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

What about similarly populated cities?

234<19751976–19901991–20052006–2020SNDi of street additions
234<19751976–19901991–20052006–2020SNDi of entire street network
OtsuBallariDjibouti

While Ballari and Djibouti both built increasingly disconnected streets over time, Otsu built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. Looking at the full network, Ballari and Djibouti both became progressively more disconnected, while Otsu grew more disconnected from 1975 through 1991-2005, then improved. Otsu and Ballari have been growing further apart in their street-network character since 1975.