Unsan in context: Street-network sprawl trends

Unsan in context

34567<19751976–19901991–20052006–2020SNDi of street additions
34567<19751976–19901991–20052006–2020SNDi of entire street network
UnsanP'yongan-bukto (Region)North Korea (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Unsan plotted against P'yŏngan-bukto and North Korea. While P'yŏngan-bukto and North Korea both peaked in 1976-1990, Unsan's new street additions peaked in 1976-1990. Most recently, Unsan's incremental SNDi fell from 4.9 to 3.34 between 1991-2005 and 2006-2020. In terms of the aggregate network, Unsan ranked 2nd out of 16 cities in P'yŏngan-bukto and 7th out of 92 in North Korea as of 2020.

New Street Additions (2006–2020)

SNDi value
3.34
Rank in North Korea
16th of 92
Rank in P'yŏngan-bukto
3rd of 16

Entire Network (Aggregate)

SNDi value
3.47
Rank in North Korea
7th of 92
Rank in P'yŏngan-bukto
2nd of 16

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

What about similarly populated cities?

2.73.64.55.4<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.4<19751976–19901991–20052006–2020SNDi of entire street network
UnsanSatturHusainabad

While Sattur and Husainabad both built increasingly disconnected streets over time, Unsan built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. Looking at the full network, Sattur and Husainabad both became progressively more disconnected, while Unsan grew more disconnected from 1975 through 1991-2005, then improved. Unsan and Sattur have been growing further apart in their street-network character since 1975.