Abyan: 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 Abyan, Yemen on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Abyan as of 2014, the overall level of street-network sprawl is 3.96, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 7.43, 7.67, nan and 2.39. Data was not available in 1991-2000.
Quantity of street network construction: The street network in Abyan spans a total of 1362 kilometers. The period with the greatest volume of street construction was 2001-2014. These roads have an SNDi of 2.39, 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 7.43, 6.86, 7.26 and 3.96. Disconnectivity in Abyan's street network follows a zig-zag trend. In 2001-2014, the region was most disconnected; while it was most connected in 1975.
The level of street-network sprawl in new development in Abyan followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in Abyan, we can consider one of its most populous cities: Lawdar. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Lawdar followed a zig-zag trend.
How do development practices in Abyan fare in comparison to others in Yemen? Most recently in 2001-2014, street construction in Abyan was the 14th-most disconnected out of the 16 regions in Yemen. Its position in the ranks since 1975 has risen; relative to other regions in Yemen, street construction in Abyan has become more disconnected. Abyan ranked 5th in 1975, 2nd in 1976-1990 and 14th in 2001-2014. There was no ranking in 1991-2000 due to unavailable data.
As of 2014, the city with the most disconnected street network in Abyan is Lawdar with an SNDi of 3.01, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Lawdar with an SNDi of 3.01, which is in the 40th to 60th percentile of disconnectedness. See trends for these cities: Lawdar, Lawdar
The level of street-network sprawl in the aggregate network in Abyan followed a zig-zag trend with an overall decrease. To get a sense of how the aggregate street network has changed in Abyan, we can consider one of its most populous cities: Lawdar. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Lawdar followed a zig-zag trend.
To date, Abyan is the 11th-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 Abyan has become more connected. Abyan ranked 5th in 1975, 5th in 1976-1990, 6th in 1991-2000 and 11th in 2001-2014.