Kaduna: region in Nigeria
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 Kaduna, Nigeria on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Kaduna as of 2014, the overall level of street-network sprawl is 2.6, 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 1.99, 2.25, 3.49 and 2.87. Street construction in Kaduna increased in disconnectivity initially but has since improved. The streets constructed in 1991-2000 were the most disconnected.
Quantity of street network construction: The street network in Kaduna spans a total of 20323 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 2.87, 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 1.99, 2.12, 2.32 and 2.6. Overall, the SNDi of the aggregate street network has risen: the street network in Kaduna has become more disconnected.
The level of street-network sprawl in new development in Kaduna peaked in 1991-2000. To get a sense of how street development has changed in Kaduna, we can consider three of its most populous cities: Kaduna, Zaria and Kafanchan. Out of the three cities, Kaduna does not follow the same trend as the region. The level of street-network sprawl in new development in Kaduna followed a zig-zag trend with an overall increase.
How do development practices in Kaduna fare in comparison to others in Nigeria? Most recently in 2001-2014, street construction in Kaduna was the 25th-most disconnected out of the 37 regions in Nigeria. Its position in the ranks since 1975 has fallen; relative to other regions in Nigeria, street construction in Kaduna has become more connected. Kaduna ranked 23rd in 1975, 25th in 1976-1990, 20th in 1991-2000 and 25th in 2001-2014.
As of 2014, the city with the most disconnected street network in Kaduna is Samunakar with an SNDi of 3.23, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Anchau with an SNDi of -1.42, which is very well-connected. See trends for these cities: Anchau, Samunakar
The level of street-network sprawl in the aggregate network in Kaduna rose steadily. To get a sense of how the aggregate street network has changed in Kaduna, we can consider three of its most populous cities: Kaduna, Zaria and Kafanchan. Out of the three cities, Kaduna and Kafanchan do not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Kaduna was at its lowest in 1976-1990. The level of street-network sprawl in the aggregate network in Kafanchan peaked in 1991-2000.
To date, Kaduna is the 26th-most disconnected out of the 37 regions in Nigeria. Its position in the ranks since 1975 has fallen; relative to other regions in Nigeria, the street network in Kaduna has become more connected. Kaduna ranked 23rd in 1975, 26th in 1976-1990, 26th in 1991-2000 and 26th in 2001-2014.