Nan'an in context: Street-network sprawl trends

Nan'an in context

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
Nan'anFujian (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Nan'an plotted against Fujian and China. While Fujian and China both followed a zig-zag trend with an overall increase, Nan'an's new street additions followed a zig-zag trend with an overall increase. Most recently, Nan'an's incremental SNDi rose from 2.81 to 4.0 between 1991-2005 and 2006-2020. In terms of the aggregate network, Nan'an ranked 27th out of 75 cities in Fujian as of 2020.

New Street Additions (2006–2020)

SNDi value
4.0
Rank in Fujian
46th of 75

Entire Network (Aggregate)

SNDi value
2.91
Rank in Fujian
27th of 75

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

What about similarly populated cities?

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
Nan'anBryanskKalar

In new street additions, Nan'an fluctuated in its street-construction patterns, while Bryansk built increasingly disconnected streets from 1975 through 1991-2005, then improved and Kalar built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Notably, Nan'an had a more connected network than Kalar in 1975 but the two have since reversed their relative ranking.