Tongjiang in context: Street-network sprawl trends

Tongjiang in context

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
TongjiangHeilongjiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tongjiang plotted against Heilongjiang and China. While Heilongjiang and China both followed a zig-zag trend with an overall increase, Tongjiang's new street additions followed a zig-zag trend with an overall increase. Most recently, Tongjiang's incremental SNDi rose from 1.4 to 2.59 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tongjiang ranked 8th out of 67 cities in Heilongjiang and 85th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.59
Rank in China
582nd of 1843
Rank in Heilongjiang
26th of 67

Entire Network (Aggregate)

SNDi value
1.66
Rank in China
85th of 1843
Rank in Heilongjiang
8th of 67

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

What about similarly populated cities?

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
TongjiangMelipillaSantai

In new street additions, Tongjiang fluctuated in its street-construction patterns, while Melipilla built increasingly disconnected streets from 1975 through 1991-2005, then improved and Santai built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Tongjiang and Melipilla both became progressively more disconnected, while Santai became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.