Yong'an in context: Street-network sprawl trends

Yong'an in context

3.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
3.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
Yong'anFujian (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yong'an plotted against Fujian and China. The SNDi of new construction in Yong'an fell steadily, compared to Fujian which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yong'an's incremental SNDi fell from 3.82 to 3.15 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yong'an ranked 57th out of 75 cities in Fujian as of 2020.

New Street Additions (2006–2020)

SNDi value
3.15
Rank in Fujian
25th of 75

Entire Network (Aggregate)

SNDi value
4.14
Rank in Fujian
57th of 75

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

What about similarly populated cities?

3456<19751976–19901991–20052006–2020SNDi of street additions
3456<19751976–19901991–20052006–2020SNDi of entire street network
Yong'anEmbuShunan

In new street additions, Yong'an built increasingly connected streets over time, while Embu built increasingly disconnected streets over time and Shunan fluctuated in its street-construction patterns. Looking at the full network, Embu and Shunan both became progressively more disconnected, while Yong'an became progressively more connected. Notably, Yong'an had a more sprawly network than Embu in 1975 but the two have since reversed their relative ranking.