Miyakonojo 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 Miyakonojo plotted against Miyazaki and Japan. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Miyakonojo's incremental SNDi rose from 1.61 to 1.77 between 1991-2005 and 2006-2020. In terms of the aggregate network, Miyakonojo ranked 1st out of 3 cities in Miyazaki and 3rd out of 135 in Japan as of 2020.

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

What about similarly populated cities?

• Putrajaya, Malaysia
• Đức Hòa, Vietnam
• Arapongas, Brazil
• Winterthur, Switzerland
• Garoowe, Somalia
• Gorzów Wielkopolski, Poland

In new street additions, Miyakonojo fluctuated in its street-construction patterns, while Putrajaya built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Winterthur built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Miyakonojo and Winterthur both became progressively more disconnected, while Putrajaya became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Miyakonojo and Winterthur have been growing further apart in their street-network character since 1975.