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 Algeria on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Algeria as of 2014, the overall level of street-network sprawl is 2.39, 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 2.65, 2.21, 2.37 and 2.96. The disconnectivity of new streets constructed in Algeria fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Algeria spans a total of 154020 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 2.21, 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 2.65, 2.27, 2.3 and 2.39. The SNDi of the aggregate street network in fell at first, but Algeria has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Algeria was at its lowest in 1976-1990. To get a sense of how street development has changed in Algeria, we can consider three of its most populous regions: Alger, Oran and Blida. Out of the three regions, Blida does not follow the same trend as the country. The level of street-network sprawl in new development in Blida followed a zig-zag trend with an overall increase.
How do development practices in Algeria fare in comparison to others in the world? Most recently in 2001-2014, street construction in Algeria was the 125th-most disconnected out of the 155 countries in the world. Its position in the ranks since 1975 has fallen; relative to other countries in the world, street construction in Algeria has become more connected. Algeria ranked 84th in 1975, 121st in 1976-1990, 136th in 1991-2000 and 125th in 2001-2014.
The largest city in Algeria is Algiers, with a population of 3857200 people. Taking into account the entire (i.e. aggregate) street network in Algiers as of 2014, the overall level of street-network sprawl is 4.11, which is highly disconnected. The level of street-network sprawl in new development in Algiers was at its lowest in 1976-1990.
As of 2014, the city with the most disconnected street network in Algeria is Medea with an SNDi of 6.13, which is highly disconnected. Conversely, the most connected city is Tulqa with an SNDi of -0.45, which is very well-connected. See trends for these cities: Tulqa, Medea
The level of street-network sprawl in the aggregate network in Algeria was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Algeria, we can consider three of its most populous regions: Alger, Oran and Blida. Disconnectivity in the most populous cities in Algeria follow the same country trend.
To date, Algeria is the 121st-most disconnected out of the 155 countries in the world. Its position in the ranks since 1975 has fallen; relative to other countries in the world, the street network in Algeria has become more connected. Algeria ranked 84th in 1975, 115th in 1976-1990, 118th in 1991-2000 and 121st in 2001-2014.
The largest city in Algeria is Algiers, with a population of 3857200 people. Taking into account the entire (i.e. aggregate) street network in Algiers as of 2014, the overall level of street-network sprawl is 4.11, which is highly disconnected. The level of street-network sprawl in the aggregate network in Algiers was at its lowest in 1976-1990.
- Tindouf
- Béchar
- Tlemcen
- Aïn Témouchent
- Oran
- Sidi Bel Abbès
- Naâma
- Adrar
- Mascara
- Mostaganem
- Saïda
- Relizane
- El Bayadh
- Tiaret
- Chlef
- Tissemsilt
- Aïn Defla
- Laghouat
- Tipaza
- Médéa
- Blida
- Alger
- Djelfa
- Ghardaïa
- Boumerdès
- M'Sila
- Bouira
- Tizi Ouzou
- Bordj Bou Arréridj
- Béjaïa
- Biskra
- Sétif
- Batna
- Ouargla
- Jijel
- Mila
- Tamanghasset
- Constantine
- Oum el Bouaghi
- Skikda
- El Oued
- Khenchela
- Guelma
- Souk Ahras
- Annaba
- Tébessa