Street-network Sprawl in Mamoudzou, France

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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:

• nodal degree
• dendricity, the tree-likeness of the street network
• circuity, the ratio of the distance by road to the straight-line distance of two locations on the street network
• sinuosity, the curviness of a street

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:

• Global trends toward urban street-network sprawl
• A global assessment of street-network sprawl

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

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Mamoudzou: city in France

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 Mamoudzou, France on the sprawlmap

How have Mamoudzou's street networks changed over time?

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Mamoudzou as of 2014, the overall level of street-network sprawl is 4.76, which is highly disconnected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 4.67, nan, nan and nan. Data was not available in 1976-1990, 1991-2000 and 2001-2014.

Quantity of street network construction: The street network in Mamoudzou spans a total of 136 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 4.67, which is highly disconnected.

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 4.67, 4.67, 4.67 and 4.76. Overall, the SNDi of the aggregate street network has risen: the street network in Mamoudzou has become more disconnected.

Mamoudzou in context: Street-network sprawl of new development

Mamoudzou and Mamoudzou 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 Mamoudzou's street network construction.

How do development practices in Mamoudzou fare in comparison to others in Mamoudzou? out of the 1 cities in Mamoudzou. Mamoudzou ranked 1st in 1975. There was no ranking in 1976-1990, 1991-2000, and 2001-2014 due to unavailable data.

Mamoudzou and France 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 France's street network construction.

How do development practices in Mamoudzou fare in comparison to others in France? out of the 76 cities in France. Mamoudzou ranked 4th in 1975. There was no ranking in 1976-1990, 1991-2000, and 2001-2014 due to unavailable data.

Mamoudzou in context: Aggregate street-network sprawl

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

To date, Mamoudzou is the 1st-most disconnected out of the 1 cities in Mamoudzou. Its position in the ranks since 1975 has not changed. Mamoudzou ranked 1st in 1975, 1st in 1976-1990, 1st in 1991-2000 and 1st in 2001-2014.

Mamoudzou and France do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Mamoudzou rose steadily, while the SNDi of street constructions in France rose steadily.

To date, Mamoudzou is the 6th-most disconnected out of the 76 cities in France. Its position in the ranks since 1975 has fallen; relative to other cities in France, the street network in Mamoudzou has become more connected. Mamoudzou ranked 4th in 1975, 6th in 1976-1990, 6th in 1991-2000 and 6th in 2001-2014.

What about other similarly-populated cities?

As of 2015, Mamoudzou had a built-up area of 5.12 square kilometers, and a population of 84978 people.

These are some other cities with approximately the same population:

• Chandrakona Road, India
• Gouda, Netherlands
• Leticia, Brazil