Kirishima in context: Street-network sprawl trends

Kirishima in context

1.522.533.5<19751976–19901991–20052006–2020SNDi of street additions
1.522.533.5<19751976–19901991–20052006–2020SNDi of entire street network
KirishimaKagoshima (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Kirishima plotted against Kagoshima and Japan. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Kirishima's incremental SNDi rose from 2.03 to 2.03 between 1991-2005 and 2006-2020. In terms of the aggregate network, Kirishima ranked 1st out of 3 cities in Kagoshima and 27th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.03
Rank in Japan
25th of 135
Rank in Kagoshima
1st of 3

Entire Network (Aggregate)

SNDi value
1.81
Rank in Japan
27th of 135
Rank in Kagoshima
1st of 3

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
KirishimaTipitapaJizan

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