Kordestan: region in Iran
What exactly constitutes the spatial extent of the city? For these aggregations, we used the Global Human Settlement Layer Urban Center Database (GHS-UCDB) to define the boundaries of the city. These cities -- or urban centers -- cover areas that are densely populated and built-up, and so may extend beyond the spatial borders of these cities that we may be familiar with. The GHS area is shaded in blue.
View Kordestan, Iran on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Kordestan as of 2014, the overall level of street-network sprawl is 2.96, which is in the 40th to 60th percentile of disconnectedness.
Trends in street network construction: The SNDis of street construction for the respective time periods are 2.47, 2.06, 3.08 and 4.24. The disconnectivity of new streets constructed in Kordestan fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Kordestan spans a total of 6752 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 4.24, which is highly disconnected.
Effect on the aggregate network: New construction in each period adds to the total stock of streets, but does not change streets that have already been built. Therefore, it has a limited effect on the street network as a whole. The SNDis of the aggregate street network in the respective time periods are 2.47, 2.08, 2.26 and 2.96. The SNDi of the aggregate street network in fell at first, but Kordestan has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Kordestan was at its lowest in 1976-1990. To get a sense of how street development has changed in Kordestan, we can consider three of its most populous cities: Sanandaj, Saqqez and Marivan. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Sanandaj rose steadily. The level of street-network sprawl in new development in Saqqez followed a zig-zag trend. The level of street-network sprawl in new development in Marivan followed a zig-zag trend.
How do development practices in Kordestan fare in comparison to others in Iran? Most recently in 2001-2014, street construction in Kordestan was the 14th-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has risen; relative to other regions in Iran, street construction in Kordestan has become more disconnected. Kordestan ranked 29th in 1975, 25th in 1976-1990, 19th in 1991-2000 and 14th in 2001-2014.
As of 2014, the city with the most disconnected street network in Kordestan is Divandarreh with an SNDi of 1.92, which is relatively well-connected. Conversely, the most connected city is Saqqez with an SNDi of 0.89, which is relatively well-connected. See trends for these cities: Saqqez, Divandarreh
The level of street-network sprawl in the aggregate network in Kordestan was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Kordestan, we can consider three of its most populous cities: Sanandaj, Saqqez and Marivan. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Sanandaj rose steadily. The level of street-network sprawl in the aggregate network in Saqqez followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Marivan followed a zig-zag trend.
To date, Kordestan is the 20th-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has risen; relative to other regions in Iran, the street network in Kordestan has become more disconnected. Kordestan ranked 29th in 1975, 28th in 1976-1990, 27th in 1991-2000 and 20th in 2001-2014.