Yunan in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yunan plotted against Guangdong and China. The SNDi of new construction in Yunan peaked in 1976-1990, 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, Yunan's incremental SNDi fell from 2.41 to 0.48 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yunan ranked 23rd out of 133 cities in Guangdong and 475th out of 1843 in China as of 2020.

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

What about similarly populated cities?

• Shikarpur, India
• Zhelin, China
• Chambéry, France
• Gola Bazar, India
• Longquan, China
• Tohana, India

In new street additions, Yunan built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Shikarpur built increasingly disconnected streets from 1975 through 1991-2005, then improved and Gola Bazar built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Yunan grew more disconnected from 1975 through 1991-2005, then improved, while Shikarpur became progressively more disconnected and Gola Bazar became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Yunan had a more sprawly network than Shikarpur in 1975 but the two have since reversed their relative ranking.