Street-network Sprawl in أدري Adré, Chad

What is Street-network sprawl?

Street-network Sprawl is a way to measure urban sprawl, worldwide, through the connectedness of the streets. Less sprawl means more connected, more walkable streets. Well-connected streets – like New York City’s grid – are more walkable and can be served by public transit.

The street network is permanent, and its connectivity affects the livability and environmental footprint of cities for decades and centuries to come. In places with more connected streets, residents drive less and walk more. A well-connected street network is associated with better outcomes for health, the environment, sustainable consumption, social integration, and equity.

We can quantify how connected street networks are with the Street Network Disconnectedness Index (SNDi).

SNDi -- our measure of street-network sprawl (disconnectedness)

The SNDi is a comprehensive measurement of “sprawl”. It captures:

A higher SNDi means less-connected streets – i.e., more sprawl. For the 10137 cities in our dataset, the average SNDi is 2.25, with half of the cities' SNDis falling between 1.08 and 3.25.

More information on the sprawl index can be found in these research papers:

To see the state of street-network sprawl across the globe, visit the sprawlmap.

أدري Adré: city in Ouaddaï, Chad

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 أدري Adré, Chad on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in أدري Adré as of 2014, the overall level of street-network sprawl is -0.42, which is very well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.51, nan, nan and -0.59. Data was not available in 1976-1990 and 1991-2000.

Quantity of street network construction: The street network in أدري Adré spans a total of 41 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of -0.59, 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 0.51, 0.51, 0.51 and -0.42. Overall, the SNDi of the aggregate street network has fallen: the street network in أدري Adré has become more connected. This decrease has quickened: between 1975 and 1976-1990, SNDi fell by 0.0 points, but between 1991-2000 and 2001-2014, it fell by just 0.93.

أدري Adré and Ouaddaï do not follow the same trend in the disconnectivity of their street network constructions. There was not enough data from the city, as well as the Ouaddaï's street network construction.

How do development practices in أدري Adré fare in comparison to others in Ouaddaï? Most recently in 2001-2014, street construction in أدري Adré was the 2nd-most disconnected out of the 2 cities in Ouaddaï. أدري Adré ranked 1st in 1975 and 2nd in 2001-2014. There was no ranking in 1976-1990 and 1991-2000 due to unavailable data.

أدري Adré and Chad do not follow the same trend in the disconnectivity of their street network constructions. There was not enough data from the city, while the SNDi of street constructions in Chad peaked in 1976-1990.

How do development practices in أدري Adré fare in comparison to others in Chad? Most recently in 2001-2014, street construction in أدري Adré was the 19th-most disconnected out of the 26 cities in Chad. أدري Adré ranked 3rd in 1975 and 19th in 2001-2014. There was no ranking in 1976-1990 and 1991-2000 due to unavailable data.

أدري Adré and Ouaddaï do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in أدري Adré fell steadily, while the SNDi of street constructions in Ouaddaï peaked in 1976-1990.

To date, أدري Adré is the 2nd-most disconnected out of the 2 cities in Ouaddaï. Its position in the ranks since 1975 has fallen; relative to other cities in Ouaddaï, the street network in أدري Adré has become more connected. أدري Adré ranked 1st in 1975, 1st in 1976-1990, 1st in 1991-2000 and 2nd in 2001-2014.

أدري Adré and Chad do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in أدري Adré fell steadily, while the SNDi of street constructions in Chad rose steadily.

To date, أدري Adré is the 19th-most disconnected out of the 26 cities in Chad. Its position in the ranks since 1975 has fallen; relative to other cities in Chad, the street network in أدري Adré has become more connected. أدري Adré ranked 3rd in 1975, 6th in 1976-1990, 8th in 1991-2000 and 19th in 2001-2014.

As of 2015, أدري Adré had a built-up area of 0.89 square kilometers, and a population of 314794 people.

These are some other cities with approximately the same population: