Golestan: 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 Golestan, Iran on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Golestan as of 2014, the overall level of street-network sprawl is 3.62, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 3.85, 3.14, 3.88 and 5.11. The disconnectivity of new streets constructed in Golestan fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Golestan spans a total of 3010 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 3.14, which is in the 40th to 60th percentile of disconnectedness.
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 3.85, 3.34, 3.36 and 3.62. The SNDi of the aggregate street network in fell at first, but Golestan has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Golestan was at its lowest in 1976-1990. To get a sense of how street development has changed in Golestan, we can consider three of its most populous cities: Gorgan, Gonbad-e Qabus and Azadshahr. Out of the three cities, Gorgan and Gonbad-e Qabus do not follow the same trend as the region. The level of street-network sprawl in new development in Gorgan followed a zig-zag trend with an overall decrease. The level of street-network sprawl in new development in Gonbad-e Qabus followed a zig-zag trend with an overall increase.
How do development practices in Golestan fare in comparison to others in Iran? Most recently in 2001-2014, street construction in Golestan was the 3rd-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 Golestan has become more disconnected. Golestan ranked 15th in 1975, 6th in 1976-1990, 9th in 1991-2000 and 3rd in 2001-2014.
As of 2014, the city with the most disconnected street network in Golestan is Aghghala with an SNDi of 3.82, which is highly disconnected. Conversely, the most connected city is Gilan Tappeh with an SNDi of 1.43, which is relatively well-connected. See trends for these cities: Gilan Tappeh, Aghghala
The level of street-network sprawl in the aggregate network in Golestan was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Golestan, we can consider three of its most populous cities: Gorgan, Gonbad-e Qabus and Azadshahr. Disconnectivity in the most populous cities in Golestan follow the same region trend.
To date, Golestan is the 8th-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 Golestan has become more disconnected. Golestan ranked 15th in 1975, 10th in 1976-1990, 10th in 1991-2000 and 8th in 2001-2014.