Somali: region in Ethiopia
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 Somali, Ethiopia on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Somali as of 2014, the overall level of street-network sprawl is 2.21, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 2.23, 3.59, 1.84 and 2.2. Disconnectivity in street construction in Somali follows a zig-zag trend. In 1991-2000, street construction was most disconnected, while construction was most connected in 1976-1990.
Quantity of street network construction: The street network in Somali spans a total of 8813 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 2.2, 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 2.23, 3.16, 2.24 and 2.21. The aggregate street network in Somali increased in disconnectivity initially,but the trend has turned around after 1990.
The level of street-network sprawl in new development in Somali followed a zig-zag trend with an overall decrease. To get a sense of how street development has changed in Somali, we can consider three of its most populous cities: Jijiga, Kebri Dehar and Dasgahbur. Out of the three cities, Jijiga and Dasgahbur do not follow the same trend as the region. The level of street-network sprawl in new development in Jijiga followed a zig-zag trend. The level of street-network sprawl in new development in Dasgahbur followed a zig-zag trend.
How do development practices in Somali fare in comparison to others in Ethiopia? Most recently in 2001-2014, street construction in Somali was the 11th-most disconnected out of the 11 regions in Ethiopia. Its position in the ranks since 1975 has fallen; relative to other regions in Ethiopia, street construction in Somali has become more connected. Somali ranked 6th in 1975, 2nd in 1976-1990, 8th in 1991-2000 and 11th in 2001-2014.
As of 2014, the city with the most disconnected street network in Somali is Cabudwaaq with an SNDi of 2.95, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Hartishek with an SNDi of -0.74, which is very well-connected. See trends for these cities: Hartishek, Cabudwaaq
The level of street-network sprawl in the aggregate network in Somali peaked in 1976-1990. To get a sense of how the aggregate street network has changed in Somali, we can consider three of its most populous cities: Jijiga, Kebri Dehar and Dasgahbur. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Jijiga followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Kebri Dehar followed a zig-zag trend with an overall decrease. The level of street-network sprawl in the aggregate network in Dasgahbur followed a zig-zag trend.
To date, Somali is the 11th-most disconnected out of the 11 regions in Ethiopia. Its position in the ranks since 1975 has fallen; relative to other regions in Ethiopia, the street network in Somali has become more connected. Somali ranked 6th in 1975, 2nd in 1976-1990, 10th in 1991-2000 and 11th in 2001-2014.