Qom: 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 Qom, Iran on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Qom as of 2014, the overall level of street-network sprawl is 2.69, 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 3.1, 2.13, 2.36 and 3.87. The disconnectivity of new streets constructed in Qom fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Qom spans a total of 3226 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 3.87, 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 3.1, 2.23, 2.23 and 2.69. The SNDi of the aggregate street network in fell at first, but Qom has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Qom was at its lowest in 1976-1990. To get a sense of how street development has changed in Qom, we can consider three of its most populous cities: Qom, Pardisan and Shokuhieh Industrial Town. Out of the three cities, Pardisan and Shokuhieh Industrial Town do not follow the same trend as the region. The level of street-network sprawl in new development in Pardisan followed a zig-zag trend. The level of street-network sprawl in new development in Shokuhieh Industrial Town followed a zig-zag trend.
How do development practices in Qom fare in comparison to others in Iran? Most recently in 2001-2014, street construction in Qom was the 16th-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 Qom has become more disconnected. Qom ranked 23rd in 1975, 22nd in 1976-1990, 29th in 1991-2000 and 16th in 2001-2014.
As of 2014, the city with the most disconnected street network in Qom is Pardisan with an SNDi of 4.83, which is highly disconnected. Conversely, the most connected city is Qom with an SNDi of 2.09, which is relatively well-connected. See trends for these cities: Qom, Pardisan
The level of street-network sprawl in the aggregate network in Qom was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Qom, we can consider three of its most populous cities: Qom, Pardisan and Shokuhieh Industrial Town. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Qom was at its lowest in 1991-2000. The level of street-network sprawl in the aggregate network in Pardisan followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Shokuhieh Industrial Town followed a zig-zag trend.
To date, Qom is the 27th-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has fallen; relative to other regions in Iran, the street network in Qom has become more connected. Qom ranked 23rd in 1975, 25th in 1976-1990, 28th in 1991-2000 and 27th in 2001-2014.