Yichun in context: Street-network sprawl trends

Yichun in context

33.64.24.8<19751976–19901991–20052006–2020SNDi of street additions
33.64.24.8<19751976–19901991–20052006–2020SNDi of entire street network
YichunJiangxi (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yichun plotted against Jiangxi and China. The SNDi of new construction in Yichun peaked in 1976-1990, compared to Jiangxi which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yichun's incremental SNDi fell from 3.11 to 3.04 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yichun ranked 57th out of 82 cities in Jiangxi as of 2020.

New Street Additions (2006–2020)

SNDi value
3.04
Rank in Jiangxi
51st of 82

Entire Network (Aggregate)

SNDi value
3.12
Rank in Jiangxi
57th of 82

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

What about similarly populated cities?

0.81.62.43.2<19751976–19901991–20052006–2020SNDi of street additions
0.81.62.43.2<19751976–19901991–20052006–2020SNDi of entire street network
YichunIzhevskMar del Plata

In new street additions, Yichun built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Izhevsk built increasingly disconnected streets from 1975 through 1991-2005, then improved and Mar del Plata fluctuated in its street-construction patterns. Looking at the full network, Izhevsk and Mar del Plata both became progressively more disconnected, while Yichun became progressively more connected. Yichun and Izhevsk have been converging in their street-network character since 1975.