Sistan and Baluchestan: 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 Sistan and Baluchestan, Iran on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Sistan and Baluchestan as of 2014, the overall level of street-network sprawl is 3.7, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 4.9, 2.89, 3.8 and 2.77. Disconnectivity in street construction in Sistan and Baluchestan follows a zig-zag trend. In 2001-2014, street construction was most disconnected, while construction was most connected in 1975.
Quantity of street network construction: The street network in Sistan and Baluchestan spans a total of 7172 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 4.9, 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 4.9, 4.18, 4.11 and 3.7. Overall, the SNDi of the aggregate street network has fallen: the street network in Sistan and Baluchestan has become more connected.
The level of street-network sprawl in new development in Sistan and Baluchestan followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in Sistan and Baluchestan, we can consider three of its most populous cities: Zahedan, Chabahar and Zabol. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Zahedan followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Chabahar was at its lowest in 1991-2000. The level of street-network sprawl in new development in Zabol followed a zig-zag trend.
How do development practices in Sistan and Baluchestan fare in comparison to others in Iran? Most recently in 2001-2014, street construction in Sistan and Baluchestan was the 28th-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has fallen; relative to other regions in Iran, street construction in Sistan and Baluchestan has become more connected. Sistan and Baluchestan ranked 5th in 1975, 11th in 1976-1990, 10th in 1991-2000 and 28th in 2001-2014.
As of 2014, the city with the most disconnected street network in Sistan and Baluchestan is Saravan with an SNDi of 3.69, which is highly disconnected. Conversely, the most connected city is Mehrestan with an SNDi of 0.13, which is very well-connected. See trends for these cities: Mehrestan, Saravan
The level of street-network sprawl in the aggregate network in Sistan and Baluchestan fell steadily. To get a sense of how the aggregate street network has changed in Sistan and Baluchestan, we can consider three of its most populous cities: Zahedan, Chabahar and Zabol. Out of the three cities, Zahedan and Zabol do not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Zahedan followed a zig-zag trend with an overall increase. The level of street-network sprawl in the aggregate network in Zabol followed a zig-zag trend.
To date, Sistan and Baluchestan is the 6th-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 Sistan and Baluchestan has become more connected. Sistan and Baluchestan ranked 5th in 1975, 2nd in 1976-1990, 2nd in 1991-2000 and 6th in 2001-2014.