Huangyan District in context: Street-network sprawl trends

Huangyan District in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
Huangyan DistrictZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Huangyan District plotted against Zhejiang and China. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Huangyan District's incremental SNDi rose from 2.57 to 3.01 between 1991-2005 and 2006-2020. In terms of the aggregate network, Huangyan District ranked 61st out of 116 cities in Zhejiang and 884th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.01
Rank in China
890th of 1843
Rank in Zhejiang
64th of 116

Entire Network (Aggregate)

SNDi value
2.83
Rank in China
884th of 1843
Rank in Zhejiang
61st of 116

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

What about similarly populated cities?

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
Huangyan DistrictArdabilHaicheng

In new street additions, Huangyan District fluctuated in its street-construction patterns, while Ardabil built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Haicheng built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Huangyan District fluctuated in connectivity, while Ardabil became progressively more connected and Haicheng fluctuated in connectivity. Notably, Huangyan District had a more connected network than Ardabil in 1975 but the two have since reversed their relative ranking.