`Adan: 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 `Adan, Yemen on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in `Adan as of 2014, the overall level of street-network sprawl is 1.86, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 1.96, 1.66, 3.26 and 1.87. Disconnectivity in street construction in `Adan follows a zig-zag trend. In 1976-1990, street construction was most disconnected, while construction was most connected in 1991-2000.
Quantity of street network construction: The street network in `Adan spans a total of 1381 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 1.87, which is relatively well-connected.
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 1.96, 1.61, 1.81 and 1.86. The SNDi of the aggregate street network in fell at first, but `Adan has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in `Adan followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in `Adan, we can consider three of its most populous cities: Al Mansurah, Aden and Hafoon. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Al Mansurah peaked in 1991-2000. The level of street-network sprawl in new development in Aden followed a zig-zag trend with an overall decrease. The level of street-network sprawl in new development in Hafoon followed a zig-zag trend.
How do development practices in `Adan fare in comparison to others in Yemen? Most recently in 2001-2014, street construction in `Adan was the 16th-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 `Adan has become more connected. `Adan ranked 13th in 1975, 11th in 1976-1990, 12th in 1991-2000 and 16th in 2001-2014.
As of 2014, the city with the most disconnected street network in `Adan is Hafoon with an SNDi of 3.15, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Al Mansurah with an SNDi of 0.86, which is relatively well-connected. See trends for these cities: Al Mansurah, Hafoon
The level of street-network sprawl in the aggregate network in `Adan was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in `Adan, we can consider three of its most populous cities: Al Mansurah, Aden and Hafoon. Out of the three cities, Al Mansurah and Hafoon do not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Al Mansurah peaked in 1991-2000. The level of street-network sprawl in the aggregate network in Hafoon followed a zig-zag trend.
To date, `Adan is the 15th-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 `Adan has become more connected. `Adan ranked 13th in 1975, 14th in 1976-1990, 15th in 1991-2000 and 15th in 2001-2014.