Tiantai County in context: Street-network sprawl trends

Tiantai County 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
Tiantai CountyZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tiantai County plotted against Zhejiang and China. The SNDi of new construction in Tiantai County peaked in 1976-1990, compared to Zhejiang which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Tiantai County's incremental SNDi fell from 1.86 to 1.77 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tiantai County ranked 2nd out of 116 cities in Zhejiang and 130th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.77
Rank in China
147th of 1843
Rank in Zhejiang
6th of 116

Entire Network (Aggregate)

SNDi value
1.8
Rank in China
130th of 1843
Rank in Zhejiang
2nd of 116

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

What about similarly populated cities?

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
Tiantai CountyAsassaHaroonabad

While Asassa and Haroonabad both built increasingly disconnected streets over time, Tiantai County built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. Looking at the full network, Asassa and Haroonabad both became progressively more disconnected, while Tiantai County grew more disconnected from 1975 through 1991-2005, then improved. Tiantai County and Haroonabad have been growing further apart in their street-network character since 1975.