Razavi Khorasan: 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 Razavi Khorasan, Iran on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Razavi Khorasan as of 2014, the overall level of street-network sprawl is 2.79, 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 2.66, 2.12, 3.13 and 3.01. Disconnectivity in street construction in Razavi Khorasan follows a zig-zag trend. In 1976-1990, street construction was most disconnected, while construction was most connected in 1991-2000.
Quantity of street network construction: The street network in Razavi Khorasan spans a total of 15108 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 3.01, 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 2.66, 2.44, 2.57 and 2.79. The SNDi of the aggregate street network in fell at first, but Razavi Khorasan has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Razavi Khorasan followed a zig-zag trend with an overall increase. To get a sense of how street development has changed in Razavi Khorasan, we can consider three of its most populous cities: Mashhad, Neyshabur and Sabzevar. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Mashhad was at its lowest in 1976-1990. The level of street-network sprawl in new development in Neyshabur was at its lowest in 1976-1990. The level of street-network sprawl in new development in Sabzevar was at its lowest in 1991-2000.
How do development practices in Razavi Khorasan fare in comparison to others in Iran? Most recently in 2001-2014, street construction in Razavi Khorasan was the 25th-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 Razavi Khorasan has become more disconnected. Razavi Khorasan ranked 27th in 1975, 23rd in 1976-1990, 18th in 1991-2000 and 25th in 2001-2014.
As of 2014, the city with the most disconnected street network in Razavi Khorasan is Rooh Abad with an SNDi of 2.88, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Dargaz with an SNDi of 1.11, which is relatively well-connected. See trends for these cities: Dargaz, Rooh Abad
The level of street-network sprawl in the aggregate network in Razavi Khorasan was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Razavi Khorasan, we can consider three of its most populous cities: Mashhad, Neyshabur and Sabzevar. Out of the three cities, Sabzevar does not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Sabzevar was at its lowest in 1991-2000.
To date, Razavi Khorasan is the 24th-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 Razavi Khorasan has become more disconnected. Razavi Khorasan ranked 27th in 1975, 21st in 1976-1990, 22nd in 1991-2000 and 24th in 2001-2014.