Street-network Sprawl in Santana, Brazil

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.

Santana: city in Amapá, Brazil

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 Santana, Brazil on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Santana as of 2014, the overall level of street-network sprawl is 2.42, 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 1.88, nan, 3.57 and 3.75. Data was not available in 1976-1990.

Quantity of street network construction: The street network in Santana spans a total of 209 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 1.88, 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 1.88, 1.88, 2.39 and 2.42. Overall, the SNDi of the aggregate street network has risen: the street network in Santana has become more disconnected.

Santana and Amapá 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 Amapá's street network construction.

How do development practices in Santana fare in comparison to others in Amapá? Most recently in 2001-2014, street construction in Santana was the 1st-most disconnected out of the 2 cities in Amapá. Its position in the ranks since 1975 has not changed. Santana ranked 1st in 1975, 1st in 1991-2000 and 1st in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

Santana and Brazil 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 Brazil rose steadily.

How do development practices in Santana fare in comparison to others in Brazil? Most recently in 2001-2014, street construction in Santana was the 118th-most disconnected out of the 348 cities in Brazil. Its position in the ranks since 1975 has fallen; relative to other cities in Brazil, street construction in Santana has become more connected. Santana ranked 91st in 1975, 90th in 1991-2000 and 118th in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

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

To date, Santana is the 1st-most disconnected out of the 2 cities in Amapá. Its position in the ranks since 1975 has not changed. Santana ranked 1st in 1975, 1st in 1976-1990, 1st in 1991-2000 and 1st in 2001-2014.

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

To date, Santana is the 83rd-most disconnected out of the 348 cities in Brazil. Its position in the ranks since 1975 has risen; relative to other cities in Brazil, the street network in Santana has become more disconnected. Santana ranked 91st in 1975, 114th in 1976-1990, 81st in 1991-2000 and 83rd in 2001-2014.

As of 2015, Santana had a built-up area of 6.33 square kilometers, and a population of 110420 people.

These are some other cities with approximately the same population: