Tonghai in context: Street-network sprawl trends

Tonghai in context

34567<19751976–19901991–20052006–2020SNDi of street additions
34567<19751976–19901991–20052006–2020SNDi of entire street network
TonghaiYunnan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tonghai plotted against Yunnan and China. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Tonghai's incremental SNDi rose from 3.09 to 6.58 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tonghai ranked 48th out of 78 cities in Yunnan and 1209th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
6.58
Rank in China
1774th of 1843
Rank in Yunnan
75th of 78

Entire Network (Aggregate)

SNDi value
3.23
Rank in China
1209th of 1843
Rank in Yunnan
48th of 78

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

What about similarly populated cities?

246<19751976–19901991–20052006–2020SNDi of street additions
246<19751976–19901991–20052006–2020SNDi of entire street network
TonghaiSelatpanjangDaying

In new street additions, Tonghai and Selatpanjang both fluctuated in its street-construction patterns, while Daying built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Tonghai and Selatpanjang both fluctuated in connectivity, while Daying became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Tonghai and Daying have been converging in their street-network character since 1975.