Tanghe in context: Street-network sprawl trends

Tanghe in context

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
TangheHenan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tanghe plotted against Henan and China. The SNDi of new construction in Tanghe was at its lowest in 1991-2005, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Tanghe's incremental SNDi rose from 1.25 to 2.1 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tanghe ranked 23rd out of 129 cities in Henan and 155th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.1
Rank in China
296th of 1843
Rank in Henan
37th of 129

Entire Network (Aggregate)

SNDi value
1.87
Rank in China
155th of 1843
Rank in Henan
23rd of 129

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

What about similarly populated cities?

036912<19751976–19901991–20052006–2020SNDi of street additions
036912<19751976–19901991–20052006–2020SNDi of entire street network
TangheSidonBugama

In new street additions, Tanghe built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Sidon built increasingly disconnected streets from 1975 through 1991-2005, then improved and Bugama fluctuated in its street-construction patterns. For the full network, Tanghe became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Sidon became progressively more disconnected and Bugama became progressively more disconnected. Tanghe and Sidon have been growing further apart in their street-network character since 1975.