Diffa: region in 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 Diffa, Niger on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Diffa as of 2014, the overall level of street-network sprawl is 2.05, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are nan, 3.04, 2.99 and 1.6. Data was not available in 1975.
Quantity of street network construction: The street network in Diffa spans a total of 2063 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 1.6, 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 nan, 2.94, 2.98 and 2.05. Data was not available in 1975.
The level of street-network sprawl in new development in Diffa followed a zig-zag trend. To get a sense of how street development has changed in Diffa, we can consider two of its most populous cities: Diffa and N'Guigmi. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Diffa followed a zig-zag trend. The level of street-network sprawl in new development in N'Guigmi followed a zig-zag trend.
How do development practices in Diffa fare in comparison to others in Niger? Most recently in 2001-2014, street construction in Diffa was the 6th-most disconnected out of the 8 regions in Niger. Its position in the ranks since 1975 has fallen; relative to other regions in Niger, street construction in Diffa has become more connected. Diffa ranked 2nd in 1976-1990, 2nd in 1991-2000 and 6th in 2001-2014. There was no ranking in 1975 due to unavailable data.
As of 2014, the city with the most disconnected street network in Diffa is N'Guigmi with an SNDi of 0.08, which is very well-connected. Conversely, the most connected city is Diffa with an SNDi of -0.21, which is very well-connected. See trends for these cities: Diffa, N'Guigmi
The level of street-network sprawl in the aggregate network in Diffa followed a zig-zag trend. To get a sense of how the aggregate street network has changed in Diffa, we can consider two of its most populous cities: Diffa and N'Guigmi. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Diffa followed a zig-zag trend. The level of street-network sprawl in the aggregate network in N'Guigmi followed a zig-zag trend.
To date, Diffa is the 3rd-most disconnected out of the 8 regions in Niger. Its position in the ranks since 1975 has fallen; relative to other regions in Niger, the street network in Diffa has become more connected. Diffa ranked 2nd in 1976-1990, 2nd in 1991-2000 and 3rd in 2001-2014. There was no ranking in 1975 due to unavailable data.