Aïn Defla: region in Algeria
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 Aïn Defla, Algeria on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Aïn Defla as of 2014, the overall level of street-network sprawl is 3.04, which is in the 40th to 60th percentile of disconnectedness.
Trends in street network construction: The SNDis of street construction for the respective time periods are 6.34, 2.62, 3.97 and 4.12. The disconnectivity of new streets constructed in Aïn Defla fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Aïn Defla spans a total of 3780 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 2.62, 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 6.34, 2.68, 2.85 and 3.04. The SNDi of the aggregate street network in fell at first, but Aïn Defla has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Aïn Defla was at its lowest in 1976-1990. To get a sense of how street development has changed in Aïn Defla, we can consider two of its most populous cities: Khemis Miliana and Ain Defla. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Khemis Miliana followed a zig-zag trend. The level of street-network sprawl in new development in Ain Defla followed a zig-zag trend.
How do development practices in Aïn Defla fare in comparison to others in Algeria? Most recently in 2001-2014, street construction in Aïn Defla was the 12th-most disconnected out of the 46 regions in Algeria. Its position in the ranks since 1975 has fallen; relative to other regions in Algeria, street construction in Aïn Defla has become more connected. Aïn Defla ranked 2nd in 1975, 14th in 1976-1990, 12th in 1991-2000 and 12th in 2001-2014.
As of 2014, the city with the most disconnected street network in Aïn Defla is Khemis Miliana with an SNDi of 3.29, which is highly disconnected. Conversely, the most connected city is Ain Defla with an SNDi of 0.46, which is relatively well-connected. See trends for these cities: Ain Defla, Khemis Miliana
The level of street-network sprawl in the aggregate network in Aïn Defla was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Aïn Defla, we can consider two of its most populous cities: Khemis Miliana and Ain Defla. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Khemis Miliana followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Ain Defla followed a zig-zag trend.
To date, Aïn Defla is the 14th-most disconnected out of the 46 regions in Algeria. Its position in the ranks since 1975 has fallen; relative to other regions in Algeria, the street network in Aïn Defla has become more connected. Aïn Defla ranked 2nd in 1975, 14th in 1976-1990, 14th in 1991-2000 and 14th in 2001-2014.