Diêm Phổ 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 Diêm Phổ plotted against Thanh Hóa and Vietnam. The SNDi of new construction in Diêm Phổ was at its lowest in 1991-2005, compared to Thanh Hóa which followed a zig-zag trend with an overall increase and Vietnam which rose steadily. Most recently, Diêm Phổ's incremental SNDi rose from 4.11 to 5.43 between 1991-2005 and 2006-2020. In terms of the aggregate network, Diêm Phổ ranked 4th out of 4 cities in Thanh Hóa and 70th out of 126 in Vietnam as of 2020.

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

What about similarly populated cities?

• Youyang, China
• Ginir, Ethiopia
• Anarkol, China
• Lingwu, China
• Morsito, Ethiopia
• Mangi 1, Democratic Republic of the Congo

In new street additions, Diêm Phổ built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Youyang fluctuated in its street-construction patterns and Lingwu built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Diêm Phổ and Youyang both became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Lingwu grew more disconnected from 1975 through 1976-1990, then improved.