Tong'an in context: Street-network sprawl trends

Tong'an in context

33.64.24.85.4<19751976–19901991–20052006–2020SNDi of street additions
33.64.24.85.4<19751976–19901991–20052006–2020SNDi of entire street network
Tong'anFujian (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tong'an plotted against Fujian and China. The SNDi of new construction in Tong'an peaked in 1991-2005, compared to Fujian which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Tong'an's incremental SNDi fell from 3.97 to 3.25 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tong'an ranked 49th out of 75 cities in Fujian and 1456th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.25
Rank in China
1025th of 1843
Rank in Fujian
29th of 75

Entire Network (Aggregate)

SNDi value
3.68
Rank in China
1456th of 1843
Rank in Fujian
49th of 75

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
Tong'anIndianapolisBatman

In new street additions, Tong'an and Indianapolis both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Batman fluctuated in its street-construction patterns. For the full network, Tong'an grew more disconnected from 1975 through 1991-2005, then improved, while Indianapolis became progressively more disconnected and Batman fluctuated in connectivity.