Street-network Sprawl in Zárate, Argentina


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.

Zárate: city in Buenos Aires, Argentina

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 Zárate, Argentina on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Zárate as of 2014, the overall level of street-network sprawl is 0.9, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.71, 1.75, 1.68 and nan. Data was not available in 2001-2014.

Quantity of street network construction: The street network in Zárate spans a total of 303 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 0.71, which is relatively 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 0.71, 0.85, 0.89 and 0.9. Overall, the SNDi of the aggregate street network has risen: the street network in Zárate has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.14 points, but between 1991-2000 and 2001-2014, it rose by just 0.02.

Zárate and Buenos Aires 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 Buenos Aires rose steadily.

How do development practices in Zárate fare in comparison to others in Buenos Aires? out of the 17 cities in Buenos Aires. Its position in the ranks since 1975 has fallen; relative to other cities in Buenos Aires, street construction in Zárate has become more connected. Zárate ranked 1st in 1975, 2nd in 1976-1990 and 6th in 1991-2000. There was no ranking in 2001-2014 due to unavailable data.

Zárate and Argentina 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 Argentina rose steadily.

How do development practices in Zárate fare in comparison to others in Argentina? out of the 70 cities in Argentina. Its position in the ranks since 1975 has fallen; relative to other cities in Argentina, street construction in Zárate has become more connected. Zárate ranked 12th in 1975, 4th in 1976-1990 and 14th in 1991-2000. There was no ranking in 2001-2014 due to unavailable data.

Zárate and Buenos Aires follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.

To date, Zárate is the 3rd-most disconnected out of the 17 cities in Buenos Aires. Its position in the ranks since 1975 has fallen; relative to other cities in Buenos Aires, the street network in Zárate has become more connected. Zárate ranked 1st in 1975, 3rd in 1976-1990, 3rd in 1991-2000 and 3rd in 2001-2014.

Zárate and Argentina follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.

To date, Zárate is the 11th-most disconnected out of the 70 cities in Argentina. Its position in the ranks since 1975 has risen; relative to other cities in Argentina, the street network in Zárate has become more disconnected. Zárate ranked 12th in 1975, 10th in 1976-1990, 9th in 1991-2000 and 11th in 2001-2014.

As of 2015, Zárate had a built-up area of 12.64 square kilometers, and a population of 70417 people.

These are some other cities with approximately the same population: