Gorgan in context: Street-network sprawl trends

Gorgan in context

3.644.44.8<19751976–19901991–20052006–2020SNDi of street additions
3.644.44.8<19751976–19901991–20052006–2020SNDi of entire street network
GorganGolestan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Gorgan plotted against Golestan and Iran. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Gorgan's incremental SNDi rose from 4.63 to 4.76 between 1991-2005 and 2006-2020. In terms of the aggregate network, Gorgan ranked 4th out of 4 cities in Golestan and 147th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
4.76
Rank in Iran
151st of 169
Rank in Golestan
4th of 4

Entire Network (Aggregate)

SNDi value
4.13
Rank in Iran
147th of 169
Rank in Golestan
4th of 4

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

What about similarly populated cities?

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
GorganGaomingOyigbo

In new street additions, Gorgan built increasingly disconnected streets over time, while Gaoming fluctuated in its street-construction patterns and Oyigbo built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Gorgan and Oyigbo both became progressively more disconnected, while Gaoming fluctuated in connectivity. Gorgan and Gaoming have been converging in their street-network character since 1975.