Yima in context: Street-network sprawl trends

Yima in context

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
YimaHenan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yima plotted against Henan and China. The SNDi of new construction in Yima rose steadily, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yima's incremental SNDi rose from 3.21 to 3.86 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yima ranked 114th out of 129 cities in Henan and 1244th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.86
Rank in China
1335th of 1843
Rank in Henan
115th of 129

Entire Network (Aggregate)

SNDi value
3.3
Rank in China
1244th of 1843
Rank in Henan
114th of 129

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
YimaEdeFall River

Yima, Ede, and Fall River all built increasingly disconnected streets over time in new street construction. The same pattern holds for the full street network. Notably, Yima had a more connected network than Ede in 1975 but the two have since reversed their relative ranking.