Sanmenxia in context: Street-network sprawl trends

Sanmenxia in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
SanmenxiaHenan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sanmenxia plotted against Henan and China. While Henan and China both followed a zig-zag trend with an overall increase, Sanmenxia's new street additions followed a zig-zag trend with an overall increase. Most recently, Sanmenxia's incremental SNDi rose from 2.43 to 3.44 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sanmenxia ranked 95th out of 129 cities in Henan and 1002nd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.44
Rank in China
1127th of 1843
Rank in Henan
104th of 129

Entire Network (Aggregate)

SNDi value
2.97
Rank in China
1002nd of 1843
Rank in Henan
95th of 129

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
SanmenxiaChaohuSpokane

In new street additions, Sanmenxia and Chaohu both fluctuated in its street-construction patterns, while Spokane built increasingly disconnected streets over time. For the full network, Sanmenxia fluctuated in connectivity, while Chaohu grew more disconnected from 1975 through 1976-1990, then improved and Spokane became progressively more disconnected. Sanmenxia and Chaohu have been converging in their street-network character since 1975.