Song County in context: Street-network sprawl trends

Song County in context

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
Song CountyHenan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Song County plotted against Henan and China. The SNDi of new construction in Song County was at its lowest in 1976-1990, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Song County's incremental SNDi rose from 2.02 to 2.84 between 1991-2005 and 2006-2020. In terms of the aggregate network, Song County ranked 58th out of 129 cities in Henan and 429th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.84
Rank in China
768th of 1843
Rank in Henan
88th of 129

Entire Network (Aggregate)

SNDi value
2.3
Rank in China
429th of 1843
Rank in Henan
58th of 129

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
Song CountyVyaraKramatorsk

In new street additions, Song County built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Vyara built increasingly disconnected streets over time and Kramatorsk built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full street network, though, all three cities follow the same trend. Song County and Vyara have been growing further apart in their street-network character since 1975.