Xian'an in context: Street-network sprawl trends

Xian'an in context

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
Xian'anGuangdong (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Xian'an plotted against Guangdong and China. The SNDi of new construction in Xian'an was at its lowest in 1991-2005, compared to Guangdong which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Xian'an's incremental SNDi rose from 2.53 to 8.35 between 1991-2005 and 2006-2020. In terms of the aggregate network, Xian'an ranked 110th out of 133 cities in Guangdong and 1671st out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
8.35
Rank in China
1814th of 1843
Rank in Guangdong
126th of 133

Entire Network (Aggregate)

SNDi value
4.59
Rank in China
1671st of 1843
Rank in Guangdong
110th of 133

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
Xian'anItabaianaLe Tampon

In new street additions, Xian'an built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Itabaiana fluctuated in its street-construction patterns and Le Tampon built increasingly disconnected streets over time. Looking at the full network, Itabaiana and Le Tampon both became progressively more disconnected, while Xian'an became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Notably, Xian'an had a more sprawly network than Le Tampon in 1975 but the two have since reversed their relative ranking.