Yizhang in context: Street-network sprawl trends

Yizhang in context

3.244.85.6<19751976–19901991–20052006–2020SNDi of street additions
3.244.85.6<19751976–19901991–20052006–2020SNDi of entire street network
YizhangHunan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yizhang plotted against Hunan and China. The SNDi of new construction in Yizhang rose steadily, compared to Hunan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yizhang's incremental SNDi rose from 3.92 to 5.78 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yizhang ranked 74th out of 89 cities in Hunan and 1508th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
5.78
Rank in China
1726th of 1843
Rank in Hunan
86th of 89

Entire Network (Aggregate)

SNDi value
3.85
Rank in China
1508th of 1843
Rank in Hunan
74th of 89

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

What about similarly populated cities?

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
YizhangKahtaDegloor

In new street additions, Yizhang built increasingly disconnected streets over time, while Kâhta fluctuated in its street-construction patterns and Degloor built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Yizhang became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Kâhta became progressively more disconnected and Degloor grew more disconnected from 1975 through 1991-2005, then improved.