Zhangjiajie in context: Street-network sprawl trends

Zhangjiajie in context

2.73.64.55.4<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.4<19751976–19901991–20052006–2020SNDi of entire street network
ZhangjiajieHunan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Zhangjiajie plotted against Hunan and China. The SNDi of new construction in Zhangjiajie peaked in 1991-2005, compared to Hunan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Zhangjiajie's incremental SNDi fell from 3.66 to 2.75 between 1991-2005 and 2006-2020. In terms of the aggregate network, Zhangjiajie ranked 49th out of 89 cities in Hunan and 1061st out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.75
Rank in China
689th of 1843
Rank in Hunan
40th of 89

Entire Network (Aggregate)

SNDi value
3.04
Rank in China
1061st of 1843
Rank in Hunan
49th of 89

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

What about similarly populated cities?

1.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
ZhangjiajiePuerto MonttKutahya

In new street additions, Zhangjiajie built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Puerto Montt fluctuated in its street-construction patterns and Kütahya built increasingly disconnected streets over time. Looking at the full network, Puerto Montt and Kütahya both became progressively more disconnected, while Zhangjiajie grew more disconnected from 1975 through 1991-2005, then improved. Notably, Zhangjiajie had a more connected network than Puerto Montt in 1975 but the two have since reversed their relative ranking.