Sefu: city in Niger, 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 Sefu, Nigeria on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Sefu as of 2014, the overall level of street-network sprawl is 0.97, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are -0.37, 1.75, 0.85 and 1.88. Disconnectivity in street construction in Sefu follows a zig-zag trend. In 1975, street construction was most disconnected, while construction was most connected in 2001-2014.
Quantity of street network construction: The street network in Sefu spans a total of 49 kilometers. The period with the greatest volume of street construction was 1975. These roads have an SNDi of -0.37, which is very 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 -0.37, 0.36, 0.5 and 0.97. Overall, the SNDi of the aggregate street network has risen: the street network in Sefu has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.73 points, but between 1991-2000 and 2001-2014, it rose by just 0.47.
Sefu and Niger do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Sefu followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Niger rose steadily.
How do development practices in Sefu fare in comparison to others in Niger? Most recently in 2001-2014, street construction in Sefu was the 6th-most disconnected out of the 13 cities in Niger. Its position in the ranks since 1975 has risen; relative to other cities in Niger, street construction in Sefu has become more disconnected. Sefu ranked 10th in 1975, 6th in 1976-1990, 8th in 1991-2000 and 6th in 2001-2014.
Sefu and Nigeria do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Sefu followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Nigeria peaked in 1991-2000.
How do development practices in Sefu fare in comparison to others in Nigeria? Most recently in 2001-2014, street construction in Sefu was the 239th-most disconnected out of the 411 cities in Nigeria. Its position in the ranks since 1975 has fallen; relative to other cities in Nigeria, street construction in Sefu has become more connected. Sefu ranked 218th in 1975, 181st in 1976-1990, 207th in 1991-2000 and 239th in 2001-2014.
Sefu and Niger follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.
To date, Sefu is the 8th-most disconnected out of the 13 cities in Niger. Its position in the ranks since 1975 has risen; relative to other cities in Niger, the street network in Sefu has become more disconnected. Sefu ranked 10th in 1975, 12th in 1976-1990, 11th in 1991-2000 and 8th in 2001-2014.
Sefu and Nigeria follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.
To date, Sefu is the 272nd-most disconnected out of the 411 cities in Nigeria. Its position in the ranks since 1975 has fallen; relative to other cities in Nigeria, the street network in Sefu has become more connected. Sefu ranked 218th in 1975, 271st in 1976-1990, 272nd in 1991-2000 and 272nd in 2001-2014.
As of 2015, Sefu had a built-up area of 1.52 square kilometers, and a population of 55956 people.
These are some other cities with approximately the same population: