Dayi in context: Street-network sprawl trends

Dayi in context

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
DayiSichuan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Dayi plotted against Sichuan and China. The SNDi of new construction in Dayi rose steadily, compared to Sichuan which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Dayi's incremental SNDi rose from 2.85 to 3.89 between 1991-2005 and 2006-2020. In terms of the aggregate network, Dayi ranked 47th out of 98 cities in Sichuan and 1026th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.89
Rank in China
1353rd of 1843
Rank in Sichuan
66th of 98

Entire Network (Aggregate)

SNDi value
2.99
Rank in China
1026th of 1843
Rank in Sichuan
47th of 98

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

What about similarly populated cities?

0.91.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
0.91.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
DayiGroningenRio Grande

In new street additions, Dayi and Groningen both built increasingly disconnected streets over time, while Rio Grande fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Notably, Dayi had a more connected network than Groningen in 1975 but the two have since reversed their relative ranking.