Xiangyin in context: Street-network sprawl trends

Xiangyin in context

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

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Xiangyin plotted against Hunan and China. The SNDi of new construction in Xiangyin peaked in 1976-1990, compared to Hunan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Xiangyin's incremental SNDi fell from 2.32 to 2.05 between 1991-2005 and 2006-2020. In terms of the aggregate network, Xiangyin ranked 12th out of 89 cities in Hunan and 294th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.05
Rank in China
272nd of 1843
Rank in Hunan
18th of 89

Entire Network (Aggregate)

SNDi value
2.13
Rank in China
294th of 1843
Rank in Hunan
12th of 89

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
XiangyinTiaretHeshan

In new street additions, Xiangyin built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Tiaret built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Heshan built increasingly disconnected streets over time. For the full network, Xiangyin grew more disconnected from 1975 through 1991-2005, then improved, while Tiaret became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Heshan became progressively more disconnected. Notably, Xiangyin had a more connected network than Tiaret in 1975 but the two have since reversed their relative ranking.