Tonghe in context: Street-network sprawl trends

Tonghe in context

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
TongheHeilongjiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tonghe plotted against Heilongjiang and China. The SNDi of new construction in Tonghe peaked in 1976-1990, compared to Heilongjiang which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Tonghe's incremental SNDi fell from 1.15 to 1.04 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tonghe ranked 1st out of 67 cities in Heilongjiang and 2nd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.04
Rank in China
14th of 1843
Rank in Heilongjiang
1st of 67

Entire Network (Aggregate)

SNDi value
0.98
Rank in China
2nd of 1843
Rank in Heilongjiang
1st of 67

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

What about similarly populated cities?

0.91.82.73.6<19751976–19901991–20052006–2020SNDi of street additions
0.91.82.73.6<19751976–19901991–20052006–2020SNDi of entire street network
TongheBelfortLake in the Hills

In new street additions, Tonghe built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Belfort fluctuated in its street-construction patterns and Lake in the Hills built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Tonghe and Lake in the Hills have been growing further apart in their street-network character since 1975.