Chengmai County in context: Street-network sprawl trends

Chengmai County in context

3.544.5<19751976–19901991–20052006–2020SNDi of street additions
3.544.5<19751976–19901991–20052006–2020SNDi of entire street network
Chengmai CountyHainan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Chengmai County plotted against Hainan and China. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Chengmai County's incremental SNDi rose from 3.43 to 3.73 between 1991-2005 and 2006-2020. In terms of the aggregate network, Chengmai County ranked 10th out of 17 cities in Hainan and 1378th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.73
Rank in China
1268th of 1843
Rank in Hainan
9th of 17

Entire Network (Aggregate)

SNDi value
3.52
Rank in China
1378th of 1843
Rank in Hainan
10th of 17

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
Chengmai CountyBudhanaGuiyi

In new street additions, Chengmai County and Guiyi both fluctuated in its street-construction patterns, while Budhana built increasingly connected streets over time. For the full network, Chengmai County and Guiyi both fluctuated in connectivity, while Budhana grew more disconnected from 1975 through 1976-1990, then improved. Chengmai County and Guiyi have been converging in their street-network character since 1975.