Yiyang in context: Street-network sprawl trends
Yiyang in context
The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yiyang plotted against Hunan and China. While Hunan and China both followed a zig-zag trend with an overall increase, Yiyang's new street additions followed a zig-zag trend with an overall increase. Most recently, Yiyang's incremental SNDi rose from 3.66 to 3.69 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yiyang ranked 68th out of 89 cities in Hunan and 1455th out of 1843 in China as of 2020.
New Street Additions (2006–2020)
- SNDi value
- 3.69
- Rank in China
- 1242nd of 1843
- Rank in Hunan
- 66th of 89
Entire Network (Aggregate)
- SNDi value
- 3.68
- Rank in China
- 1455th of 1843
- Rank in Hunan
- 68th of 89
Rankings go from most connected to most disconnected — rank 1 is the most connected.
What about similarly populated cities?
Yiyang, Yingkou, and Qingyuan all fluctuated in its street-construction patterns in new street construction. For the full network, Yiyang grew more disconnected from 1975 through 1976-1990, then improved, while Yingkou became progressively more connected and Qingyuan fluctuated in connectivity. Yiyang and Yingkou have been growing further apart in their street-network character since 1975.