Niger
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 Niger on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Niger as of 2014, the overall level of street-network sprawl is 1.72, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 0.61, 1.47, 1.74 and 2.05. In each period, new street development in Niger steadily grows more disconnected than in the last. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.86 points, but between 1991-2000 and 2001-2014, it rose by just 0.31.
Quantity of street network construction: The street network in Niger spans a total of 25637 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 2.05, 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 0.61, 1.31, 1.41 and 1.72. Overall, the SNDi of the aggregate street network has risen: the street network in Niger has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.69 points, but between 1991-2000 and 2001-2014, it rose by just 0.32.
The level of street-network sprawl in new development in Niger rose steadily. To get a sense of how street development has changed in Niger, we can consider three of its most populous regions: Niamey, Tahoua and Tillabéry. Out of the three regions, Tillabéry does not follow the same trend as the country. The level of street-network sprawl in new development in Tillabéry was at its lowest in 1976-1990.
How do development practices in Niger fare in comparison to others in the world? Most recently in 2001-2014, street construction in Niger was the 150th-most disconnected out of the 155 countries in the world. Its position in the ranks since 1975 has not changed. Niger ranked 150th in 1975, 142nd in 1976-1990, 150th in 1991-2000 and 150th in 2001-2014.
The largest city in Niger is Niamey, with a population of 1113900 people. Taking into account the entire (i.e. aggregate) street network in Niamey as of 2014, the overall level of street-network sprawl is 0.27, which is very well-connected. The level of street-network sprawl in new development in Niamey was at its lowest in 1976-1990.
As of 2014, the city with the most disconnected street network in Niger is Tanout with an SNDi of 2.01, which is relatively well-connected. Conversely, the most connected city is Tibiri with an SNDi of -0.58, which is very well-connected. See trends for these cities: Tibiri, Tanout
The level of street-network sprawl in the aggregate network in Niger rose steadily. To get a sense of how the aggregate street network has changed in Niger, we can consider three of its most populous regions: Niamey, Tahoua and Tillabéry. Out of the three regions, Tillabéry does not follow the same trend as the country. The level of street-network sprawl in the aggregate network in Tillabéry was at its lowest in 1976-1990.
To date, Niger is the 145th-most disconnected out of the 155 countries in the world. Its position in the ranks since 1975 has risen; relative to other countries in the world, the street network in Niger has become more disconnected. Niger ranked 150th in 1975, 148th in 1976-1990, 146th in 1991-2000 and 145th in 2001-2014.
The largest city in Niger is Niamey, with a population of 1113900 people. Taking into account the entire (i.e. aggregate) street network in Niamey as of 2014, the overall level of street-network sprawl is 0.27, which is very well-connected. The level of street-network sprawl in the aggregate network in Niamey was at its lowest in 1976-1990.