Street-network Sprawl in Tambogrande, Peru

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.

Tambogrande: city in Piura, Peru

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 Tambogrande, Peru on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Tambogrande as of 2014, the overall level of street-network sprawl is 0.67, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.26, nan, 1.35 and 3.4. Data was not available in 1976-1990.

Quantity of street network construction: The street network in Tambogrande spans a total of 63 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 0.26, 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 0.26, 0.26, 0.23 and 0.67. Disconnectivity in Tambogrande's street network follows a zig-zag trend. In 1991-2000, the city was most disconnected; while it was most connected in 2001-2014.

Tambogrande and Piura 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 Piura's street network construction.

How do development practices in Tambogrande fare in comparison to others in Piura? Most recently in 2001-2014, street construction in Tambogrande was the 1st-most disconnected out of the 6 cities in Piura. Its position in the ranks since 1975 has risen; relative to other cities in Piura, street construction in Tambogrande has become more disconnected. Tambogrande ranked 5th in 1975, 2nd in 1991-2000 and 1st in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

Tambogrande and Peru 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 Peru followed a zig-zag trend with an overall increase.

How do development practices in Tambogrande fare in comparison to others in Peru? Most recently in 2001-2014, street construction in Tambogrande was the 8th-most disconnected out of the 49 cities in Peru. Its position in the ranks since 1975 has risen; relative to other cities in Peru, street construction in Tambogrande has become more disconnected. Tambogrande ranked 42nd in 1975, 16th in 1991-2000 and 8th in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

Tambogrande and Piura do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Tambogrande followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Piura fell steadily.

To date, Tambogrande is the 4th-most disconnected out of the 6 cities in Piura. Its position in the ranks since 1975 has risen; relative to other cities in Piura, the street network in Tambogrande has become more disconnected. Tambogrande ranked 5th in 1975, 5th in 1976-1990, 5th in 1991-2000 and 4th in 2001-2014.

Tambogrande and Peru do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Tambogrande followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Peru was at its lowest in 1976-1990.

To date, Tambogrande is the 36th-most disconnected out of the 49 cities in Peru. Its position in the ranks since 1975 has risen; relative to other cities in Peru, the street network in Tambogrande has become more disconnected. Tambogrande ranked 42nd in 1975, 43rd in 1976-1990, 43rd in 1991-2000 and 36th in 2001-2014.

As of 2015, Tambogrande had a built-up area of 0.96 square kilometers, and a population of 71583 people.

These are some other cities with approximately the same population: