Tongyeong-si in context: Street-network sprawl trends

Tongyeong-si in context

1.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
Tongyeong-siGyeongsangnam-do (Region)South Korea (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tongyeong-si plotted against Gyeongsangnam-do and South Korea. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Tongyeong-si's incremental SNDi rose from 1.99 to 3.55 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tongyeong-si ranked 9th out of 10 cities in Gyeongsangnam-do and 39th out of 49 in South Korea as of 2020.

New Street Additions (2006–2020)

SNDi value
3.55
Rank in South Korea
41st of 49
Rank in Gyeongsangnam-do
8th of 10

Entire Network (Aggregate)

SNDi value
2.49
Rank in South Korea
39th of 49
Rank in Gyeongsangnam-do
9th of 10

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
Tongyeong-siSan MartinPaikgacha

In new street additions, Tongyeong-si and Paikgacha both fluctuated in its street-construction patterns, while San Martín built increasingly disconnected streets over time. For the full network, Tongyeong-si fluctuated in connectivity, while San Martín became progressively more disconnected and Paikgacha grew more disconnected from 1975 through 1976-1990, then improved. Notably, Tongyeong-si had a more sprawly network than San Martín in 1975 but the two have since reversed their relative ranking.