Isfahan in context: Street-network sprawl trends

Isfahan in context

3.33.63.94.2<19751976–19901991–20052006–2020SNDi of street additions
3.33.63.94.2<19751976–19901991–20052006–2020SNDi of entire street network
IsfahanEsfahan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Isfahan plotted against Esfahan and Iran. The SNDi of new construction in Isfahan followed a zig-zag trend with an overall decrease, compared to Esfahan which followed a zig-zag trend with an overall decrease and Iran which rose steadily. Most recently, Isfahan's incremental SNDi fell from 4.3 to 4.15 between 1991-2005 and 2006-2020. In terms of the aggregate network, Isfahan ranked 7th out of 8 cities in Esfahan and 148th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
4.15
Rank in Iran
135th of 169
Rank in Esfahan
7th of 8

Entire Network (Aggregate)

SNDi value
4.15
Rank in Iran
148th of 169
Rank in Esfahan
7th of 8

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

What about similarly populated cities?

34567<19751976–19901991–20052006–2020SNDi of street additions
34567<19751976–19901991–20052006–2020SNDi of entire street network
IsfahanSan SalvadorKaduna

In new street additions, Isfahan fluctuated in its street-construction patterns, while San Salvador built increasingly disconnected streets over time and Kaduna built increasingly disconnected streets from 1975 through 1991-2005, then improved. Looking at the full network, San Salvador and Kaduna both became progressively more disconnected, while Isfahan fluctuated in connectivity. Isfahan and San Salvador have been growing further apart in their street-network character since 1975.