Zhoushan in context: Street-network sprawl trends

Zhoushan in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
ZhoushanZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Zhoushan plotted against Zhejiang and China. The SNDi of new construction in Zhoushan rose steadily, compared to Zhejiang which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Zhoushan's incremental SNDi rose from 4.03 to 4.41 between 1991-2005 and 2006-2020. In terms of the aggregate network, Zhoushan ranked 94th out of 116 cities in Zhejiang and 1606th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
4.41
Rank in China
1508th of 1843
Rank in Zhejiang
96th of 116

Entire Network (Aggregate)

SNDi value
4.22
Rank in China
1606th of 1843
Rank in Zhejiang
94th of 116

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

What about similarly populated cities?

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
ZhoushanBarryDoraha

While Barry and Doraha both built increasingly disconnected streets from 1975 through 1991-2005, then improved, Zhoushan built increasingly disconnected streets over time in new street additions. For the full street network, though, all three cities follow the same trend. Notably, Zhoushan had a more connected network than Barry in 1975 but the two have since reversed their relative ranking.