Ibb: 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 Ibb, Yemen on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Ibb as of 2014, the overall level of street-network sprawl is 3.88, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 7.94, 5.26, 5.44 and 3.34. Disconnectivity in street construction in Ibb 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 Ibb spans a total of 2196 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 3.34, 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 7.94, 6.72, 6.49 and 3.88. Overall, the SNDi of the aggregate street network has fallen: the street network in Ibb has become more connected. This decrease has quickened: between 1975 and 1976-1990, SNDi fell by 1.23 points, but between 1991-2000 and 2001-2014, it fell by just 2.61.
The level of street-network sprawl in new development in Ibb followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in Ibb, we can consider three of its most populous cities: Ibb, Yarim and Al Qa`idah. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Ibb followed a zig-zag trend with an overall decrease. The level of street-network sprawl in new development in Yarim followed a zig-zag trend. The level of street-network sprawl in new development in Al Qa`idah followed a zig-zag trend with an overall decrease.
How do development practices in Ibb fare in comparison to others in Yemen? Most recently in 2001-2014, street construction in Ibb was the 10th-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 Ibb has become more connected. Ibb ranked 4th in 1975, 5th in 1976-1990, 8th in 1991-2000 and 10th in 2001-2014.
As of 2014, the city with the most disconnected street network in Ibb is Ibb with an SNDi of 2.39, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Yarim with an SNDi of 1.07, which is relatively well-connected. See trends for these cities: Yarim, Ibb
The level of street-network sprawl in the aggregate network in Ibb fell steadily. To get a sense of how the aggregate street network has changed in Ibb, we can consider three of its most populous cities: Ibb, Yarim and Al Qa`idah. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Ibb fell steadily. The level of street-network sprawl in the aggregate network in Yarim followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Al Qa`idah followed a zig-zag trend with an overall decrease.
To date, Ibb is the 12th-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 Ibb has become more connected. Ibb ranked 4th in 1975, 6th in 1976-1990, 8th in 1991-2000 and 12th in 2001-2014.