Daishan County in context: Street-network sprawl trends

Daishan County 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
Daishan CountyZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Daishan County plotted against Zhejiang and China. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Daishan County's incremental SNDi rose from 2.16 to 3.28 between 1991-2005 and 2006-2020. In terms of the aggregate network, Daishan County ranked 62nd out of 116 cities in Zhejiang and 900th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.28
Rank in China
1036th of 1843
Rank in Zhejiang
70th of 116

Entire Network (Aggregate)

SNDi value
2.85
Rank in China
900th of 1843
Rank in Zhejiang
62nd of 116

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

What about similarly populated cities?

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
Daishan CountySemnanReus

In new street additions, Daishan County and Reus both fluctuated in its street-construction patterns, while Semnan built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Daishan County fluctuated in connectivity, while Semnan became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Reus became progressively more disconnected. Daishan County and Semnan have been converging in their street-network character since 1975.