Huanglong 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 Huanglong plotted against Hainan and China. The SNDi of new construction in Huanglong was at its lowest in 1991-2005, compared to Hainan which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Huanglong's incremental SNDi rose from 3.62 to 9.31 between 1991-2005 and 2006-2020. In terms of the aggregate network, Huanglong ranked 17th out of 17 cities in Hainan and 1782nd 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?

• ዳባት, Ethiopia
• Ouarzazate, Morocco
• Ödemiş, Turkey
• Mambasa, Democratic Republic of the Congo
• Baneshwar, Bangladesh
• Adet, Ethiopia

In new street additions, Huanglong and Mambasa both built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while ዳባት built increasingly disconnected streets over time. For the full network, Huanglong became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while ዳባት became progressively more disconnected and Mambasa became progressively more connected. Huanglong and Mambasa have been growing further apart in their street-network character since 1975.