Diễn Châu in context: Street-network sprawl trends

Dien Chau in context

3.244.85.6<19751976–19901991–20052006–2020SNDi of street additions
3.244.85.6<19751976–19901991–20052006–2020SNDi of entire street network
Dien ChauNghe An (Region)Vietnam (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Diễn Châu plotted against Nghệ An and Vietnam. The SNDi of new construction in Diễn Châu followed a zig-zag trend with an overall increase, compared to Nghệ An which followed a zig-zag trend with an overall increase and Vietnam which rose steadily. Most recently, Diễn Châu's incremental SNDi rose from 3.11 to 3.47 between 1991-2005 and 2006-2020. In terms of the aggregate network, Diễn Châu ranked 2nd out of 4 cities in Nghệ An and 21st out of 126 in Vietnam as of 2020.

New Street Additions (2006–2020)

SNDi value
3.47
Rank in Vietnam
27th of 126
Rank in Nghệ An
2nd of 4

Entire Network (Aggregate)

SNDi value
3.26
Rank in Vietnam
21st of 126
Rank in Nghệ An
2nd of 4

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

What about similarly populated cities?

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
Dien ChauPiplanMerced

In new street additions, Diễn Châu fluctuated in its street-construction patterns, while Piplan fluctuated in its street-construction patterns and Merced built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Diễn Châu fluctuated in connectivity, while Piplan became progressively more connected and Merced became progressively more disconnected. Notably, Diễn Châu had a more sprawly network than Merced in 1975 but the two have since reversed their relative ranking.