Hajjah: region in Yemen
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 Hajjah, Yemen on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Hajjah as of 2014, the overall level of street-network sprawl is 7.3, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 8.64, nan, 9.9 and 6.36. Data was not available in 1976-1990.
Quantity of street network construction: The street network in Hajjah spans a total of 1953 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 6.36, 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 8.64, 9.0, 9.32 and 7.3. The aggregate street network in Hajjah increased in disconnectivity initially,but the trend has turned around after 2000.
The level of street-network sprawl in new development in Hajjah followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in Hajjah, we can consider three of its most populous cities: Abs, Harad and Hajja. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Abs followed a zig-zag trend. The level of street-network sprawl in new development in Harad followed a zig-zag trend. The level of street-network sprawl in new development in Hajja followed a zig-zag trend.
How do development practices in Hajjah fare in comparison to others in Yemen? Most recently in 2001-2014, street construction in Hajjah was the 3rd-most disconnected out of the 16 regions in Yemen. Its position in the ranks since 1975 has fallen; relative to other regions in Yemen, street construction in Hajjah has become more connected. Hajjah ranked 2nd in 1975, 1st in 1991-2000 and 3rd in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.
As of 2014, the city with the most disconnected street network in Hajjah is Abs with an SNDi of 5.38, which is highly disconnected. Conversely, the most connected city is Harad with an SNDi of 2.36, which is in the 40th to 60th percentile of disconnectedness. See trends for these cities: Harad, Abs
The level of street-network sprawl in the aggregate network in Hajjah peaked in 1991-2000. To get a sense of how the aggregate street network has changed in Hajjah, we can consider three of its most populous cities: Abs, Harad and Hajja. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Abs followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Harad followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Hajja followed a zig-zag trend.
To date, Hajjah is the 3rd-most disconnected out of the 16 regions in Yemen. Its position in the ranks since 1975 has fallen; relative to other regions in Yemen, the street network in Hajjah has become more connected. Hajjah ranked 2nd in 1975, 2nd in 1976-1990, 2nd in 1991-2000 and 3rd in 2001-2014.