Urmia in context: Street-network sprawl trends
Urmia in context
The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Urmia plotted against West Azarbaijan and Iran. While West Azarbaijan and Iran both rose steadily, Urmia's new street additions rose steadily. Most recently, Urmia's incremental SNDi rose from 4.35 to 4.38 between 1991-2005 and 2006-2020. In terms of the aggregate network, Urmia ranked 10th out of 11 cities in West Azarbaijan and 145th out of 169 in Iran as of 2020.
New Street Additions (2006–2020)
- SNDi value
- 4.38
- Rank in Iran
- 141st of 169
- Rank in West Azarbaijan
- 10th of 11
Entire Network (Aggregate)
- SNDi value
- 4.08
- Rank in Iran
- 145th of 169
- Rank in West Azarbaijan
- 10th of 11
Rankings go from most connected to most disconnected — rank 1 is the most connected.
What about similarly populated cities?
- Zurich, Switzerland
- Iloilo City, Philippines
- Zaria, Nigeria
- Acapulco, México
- Tampa, United States
- Evaton, South Africa
In new street additions, Urmia and Acapulco both built increasingly disconnected streets over time, while Zurich built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full street network, though, all three cities follow the same trend. Notably, Urmia had a more sprawly network than Acapulco in 1975 but the two have since reversed their relative ranking.