Tillabéry: 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 Tillabéry, Niger on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Tillabéry as of 2014, the overall level of street-network sprawl is 1.9, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 1.65, 0.69, 1.54 and 2.67. The disconnectivity of new streets constructed in Tillabéry fell, then rose. In 1976-1990, new street layouts were the most connected.
Quantity of street network construction: The street network in Tillabéry spans a total of 4374 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 2.67, 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 1.65, 0.85, 1.16 and 1.9. The SNDi of the aggregate street network in fell at first, but Tillabéry has worsened in disconnectivity since 1990.
The level of street-network sprawl in new development in Tillabéry was at its lowest in 1976-1990. To get a sense of how street development has changed in Tillabéry, we can consider three of its most populous cities: Téra, Tillabéri and Kollo. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Téra followed a zig-zag trend. The level of street-network sprawl in new development in Tillabéri followed a zig-zag trend. The level of street-network sprawl in new development in Kollo followed a zig-zag trend.
How do development practices in Tillabéry fare in comparison to others in Niger? Most recently in 2001-2014, street construction in Tillabéry was the 2nd-most disconnected out of the 8 regions in Niger. Its position in the ranks since 1975 has risen; relative to other regions in Niger, street construction in Tillabéry has become more disconnected. Tillabéry ranked 3rd in 1975, 7th in 1976-1990, 6th in 1991-2000 and 2nd in 2001-2014.
As of 2014, the city with the most disconnected street network in Tillabéry is Téra with an SNDi of 1.3, which is relatively well-connected. Conversely, the most connected city is Kollo with an SNDi of -0.12, which is very well-connected. See trends for these cities: Kollo, Téra
The level of street-network sprawl in the aggregate network in Tillabéry was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Tillabéry, we can consider three of its most populous cities: Téra, Tillabéri and Kollo. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Téra followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Tillabéri followed a zig-zag trend. The level of street-network sprawl in the aggregate network in Kollo followed a zig-zag trend.
To date, Tillabéry is the 4th-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 Tillabéry has become more connected. Tillabéry ranked 3rd in 1975, 6th in 1976-1990, 5th in 1991-2000 and 4th in 2001-2014.