Longshan in context: Street-network sprawl trends

Longshan in context

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

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Longshan plotted against Hunan and China. The SNDi of new construction in Longshan was at its lowest 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, Longshan's incremental SNDi rose from 1.61 to 3.44 between 1991-2005 and 2006-2020. In terms of the aggregate network, Longshan ranked 20th out of 89 cities in Hunan and 504th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.44
Rank in China
1125th of 1843
Rank in Hunan
59th of 89

Entire Network (Aggregate)

SNDi value
2.39
Rank in China
504th of 1843
Rank in Hunan
20th of 89

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
LongshanPeabodyVinh Yen

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