Sardasht in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sardasht plotted against West Azarbaijan and Iran. The SNDi of new construction in Sardasht followed a zig-zag trend with an overall increase, compared to West Azarbaijan which peaked in 1991-2005 and Iran which rose steadily. Most recently, Sardasht's incremental SNDi rose from 1.63 to 1.98 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sardasht ranked 2nd out of 11 cities in West Azarbaijan and 5th out of 169 in Iran as of 2020.

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

What about similarly populated cities?

• Ulundurpettai, India
• Pamanukan, Indonesia
• Taiping, China
• Shankarpur, India
• Chiquinquirá, Colombia
• Tashlak, Uzbekistan

In new street additions, Sardasht and Shankarpur both fluctuated in its street-construction patterns, while Ulundurpettai built increasingly disconnected streets over time. For the full network, Sardasht became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Ulundurpettai became progressively more disconnected and Shankarpur fluctuated in connectivity. Sardasht and Ulundurpettai have been growing further apart in their street-network character since 1975.