Street-network Sprawl in Vilhena, 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.

Vilhena: city in Rondônia, 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 Vilhena, Brazil on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Vilhena as of 2014, the overall level of street-network sprawl is 0.23, which is very well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.24, nan, 0.08 and 0.24. Data was not available in 1976-1990.

Quantity of street network construction: The street network in Vilhena spans a total of 398 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 0.24, 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 0.24, 0.24, 0.23 and 0.23. Disconnectivity in Vilhena's street network follows a zig-zag trend. In 1991-2000, the city was most disconnected; while it was most connected in 1975.

Vilhena and Rondônia 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 Rondônia's street network construction.

How do development practices in Vilhena fare in comparison to others in Rondônia? Most recently in 2001-2014, street construction in Vilhena was the 5th-most disconnected out of the 5 cities in Rondônia. Its position in the ranks since 1975 has not changed. Vilhena ranked 5th in 1975, 5th in 1991-2000 and 5th in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

Vilhena 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 Vilhena fare in comparison to others in Brazil? Most recently in 2001-2014, street construction in Vilhena was the 327th-most disconnected out of the 348 cities in Brazil. Its position in the ranks since 1975 has risen; relative to other cities in Brazil, street construction in Vilhena has become more disconnected. Vilhena ranked 270th in 1975, 329th in 1991-2000 and 327th in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

Vilhena and Rondônia do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Vilhena followed a zig-zag trend with an overall decrease, while the SNDi of street constructions in Rondônia rose steadily.

To date, Vilhena is the 5th-most disconnected out of the 5 cities in Rondônia. Its position in the ranks since 1975 has not changed. Vilhena ranked 5th in 1975, 5th in 1976-1990, 5th in 1991-2000 and 5th in 2001-2014.

Vilhena and Brazil do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Vilhena followed a zig-zag trend with an overall decrease, while the SNDi of street constructions in Brazil rose steadily.

To date, Vilhena is the 326th-most disconnected out of the 348 cities in Brazil. Its position in the ranks since 1975 has fallen; relative to other cities in Brazil, the street network in Vilhena has become more connected. Vilhena ranked 270th in 1975, 303rd in 1976-1990, 314th in 1991-2000 and 326th in 2001-2014.

As of 2015, Vilhena had a built-up area of 10.93 square kilometers, and a population of 75097 people.

These are some other cities with approximately the same population: