Anzhou in context: Street-network sprawl trends

Anzhou 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
AnzhouHebei (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Anzhou plotted against Hebei and China. The SNDi of new construction in Anzhou peaked in 1991-2005, compared to Hebei which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Anzhou's incremental SNDi fell from 3.83 to 3.17 between 1991-2005 and 2006-2020. In terms of the aggregate network, Anzhou ranked 80th out of 120 cities in Hebei and 1145th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.17
Rank in China
985th of 1843
Rank in Hebei
60th of 120

Entire Network (Aggregate)

SNDi value
3.16
Rank in China
1145th of 1843
Rank in Hebei
80th of 120

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
AnzhouOngjinNancha

In new street additions, Anzhou built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Ongjin built increasingly disconnected streets from 1975 through 1976-1990, then improved and Nancha fluctuated in its street-construction patterns. For the full network, Anzhou became progressively more disconnected, while Ongjin grew more disconnected from 1975 through 1991-2005, then improved and Nancha fluctuated in connectivity. Notably, Anzhou had a more connected network than Nancha in 1975 but the two have since reversed their relative ranking.