Heyun in context: Street-network sprawl trends
Heyun in context
The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Heyun plotted against Guangdong and China. The SNDi of new construction in Heyun 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, Heyun's incremental SNDi fell from 4.82 to 4.59 between 1991-2005 and 2006-2020. In terms of the aggregate network, Heyun ranked 112th out of 133 cities in Guangdong and 1699th out of 1843 in China as of 2020.
New Street Additions (2006–2020)
- SNDi value
- 4.59
- Rank in China
- 1554th of 1843
- Rank in Guangdong
- 92nd of 133
Entire Network (Aggregate)
- SNDi value
- 4.79
- Rank in China
- 1699th of 1843
- Rank in Guangdong
- 112th of 133
Rankings go from most connected to most disconnected — rank 1 is the most connected.
What about similarly populated cities?
- Haldibari, India
- Nuapatna, India
- Ishara, Nigeria
- Ariwara, Democratic Republic of the Congo
- Wijigra, Ethiopia
- Kempten (Allgäu), Germany
In new street additions, Heyun built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Haldibari fluctuated in its street-construction patterns and Ariwara built increasingly disconnected streets over time. Looking at the full network, Haldibari and Ariwara both became progressively more disconnected, while Heyun grew more disconnected from 1975 through 1991-2005, then improved. Heyun and Ariwara have been growing further apart in their street-network character since 1975.