Jizan: region in Saudi Arabia
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 Jizan, Saudi Arabia on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Jizan as of 2014, the overall level of street-network sprawl is 2.29, 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 3.69, 2.45, 2.33 and 1.97. In each period, new street development in Jizan steadily grows more connected than in the last.
Quantity of street network construction: The street network in Jizan spans a total of 1495 kilometers. It is dominated by roads constructed in 1991-2000. These roads have an SNDi of 2.33, 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 3.69, 2.45, 2.39 and 2.29. Overall, the SNDi of the aggregate street network has fallen: the street network in Jizan has become more connected.
The level of street-network sprawl in new development in Jizan fell steadily. To get a sense of how street development has changed in Jizan, we can consider three of its most populous cities: Abu Arish, Samitah and al-ddayer. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Abu Arish followed a zig-zag trend. The level of street-network sprawl in new development in Samitah followed a zig-zag trend. The level of street-network sprawl in new development in al-ddayer followed a zig-zag trend.
How do development practices in Jizan fare in comparison to others in Saudi Arabia? Most recently in 2001-2014, street construction in Jizan was the 11th-most disconnected out of the 12 regions in Saudi Arabia. Its position in the ranks since 1975 has fallen; relative to other regions in Saudi Arabia, street construction in Jizan has become more connected. Jizan ranked 4th in 1975, 3rd in 1976-1990, 10th in 1991-2000 and 11th in 2001-2014.
As of 2014, the city with the most disconnected street network in Jizan is al-ddayer with an SNDi of 4.75, which is highly disconnected. Conversely, the most connected city is Samitah with an SNDi of 1.03, which is relatively well-connected. See trends for these cities: Samitah, al-ddayer
The level of street-network sprawl in the aggregate network in Jizan fell steadily. To get a sense of how the aggregate street network has changed in Jizan, we can consider three of its most populous cities: Abu Arish, Samitah and al-ddayer. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Abu Arish followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Samitah followed a zig-zag trend. The level of street-network sprawl in the aggregate network in al-ddayer followed a zig-zag trend.
To date, Jizan is the 9th-most disconnected out of the 12 regions in Saudi Arabia. Its position in the ranks since 1975 has fallen; relative to other regions in Saudi Arabia, the street network in Jizan has become more connected. Jizan ranked 4th in 1975, 4th in 1976-1990, 5th in 1991-2000 and 9th in 2001-2014.