Hamadan: 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 Hamadan, Iran on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Hamadan as of 2014, the overall level of street-network sprawl is 3.54, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 3.55, 3.09, 3.45 and 4.25. The disconnectivity of new streets constructed in Hamadan fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Hamadan spans a total of 8406 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 4.25, 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 3.55, 3.25, 3.26 and 3.54. The SNDi of the aggregate street network in fell at first, but Hamadan has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Hamadan was at its lowest in 1976-1990. To get a sense of how street development has changed in Hamadan, we can consider three of its most populous cities: Hamedan, Malayer and Nahavand. Out of the three cities, Hamedan and Nahavand do not follow the same trend as the region. The level of street-network sprawl in new development in Hamedan was at its lowest in 1991-2000. The level of street-network sprawl in new development in Nahavand was at its lowest in 1991-2000.
How do development practices in Hamadan fare in comparison to others in Iran? Most recently in 2001-2014, street construction in Hamadan was the 13th-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 Hamadan has become more disconnected. Hamadan ranked 19th in 1975, 7th in 1976-1990, 14th in 1991-2000 and 13th in 2001-2014.
As of 2014, the city with the most disconnected street network in Hamadan is Hamedan with an SNDi of 3.36, which is highly disconnected. Conversely, the most connected city is Nahavand with an SNDi of 1.25, which is relatively well-connected. See trends for these cities: Nahavand, Hamedan
The level of street-network sprawl in the aggregate network in Hamadan was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Hamadan, we can consider three of its most populous cities: Hamedan, Malayer and Nahavand. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Hamedan was at its lowest in 1991-2000. The level of street-network sprawl in the aggregate network in Malayer was at its lowest in 1991-2000. The level of street-network sprawl in the aggregate network in Nahavand was at its lowest in 1991-2000.
To date, Hamadan is the 9th-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 Hamadan has become more disconnected. Hamadan ranked 19th in 1975, 11th in 1976-1990, 11th in 1991-2000 and 9th in 2001-2014.