Street-network Sprawl in Ilave, 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.

Ilave: city in Puno, 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 Ilave, Peru on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Ilave as of 2014, the overall level of street-network sprawl is -0.05, which is very well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are -0.43, 1.76, 0.29 and 3.55. Disconnectivity in street construction in Ilave follows a zig-zag trend. In 1975, street construction was most disconnected, while construction was most connected in 2001-2014.

Quantity of street network construction: The street network in Ilave spans a total of 80 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of -0.43, 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 -0.43, -0.26, -0.1 and -0.05. Overall, the SNDi of the aggregate street network has risen: the street network in Ilave has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.17 points, but between 1991-2000 and 2001-2014, it rose by just 0.05.

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

How do development practices in Ilave fare in comparison to others in Puno? Most recently in 2001-2014, street construction in Ilave was the 1st-most disconnected out of the 3 cities in Puno. Its position in the ranks since 1975 has risen; relative to other cities in Puno, street construction in Ilave has become more disconnected. Ilave ranked 2nd in 1975, 1st in 1976-1990, 3rd in 1991-2000 and 1st in 2001-2014.

Ilave and Peru do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Ilave followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Peru followed a zig-zag trend with an overall increase.

How do development practices in Ilave fare in comparison to others in Peru? Most recently in 2001-2014, street construction in Ilave was the 7th-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 Ilave has become more disconnected. Ilave ranked 47th in 1975, 4th in 1976-1990, 28th in 1991-2000 and 7th in 2001-2014.

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

To date, Ilave is the 3rd-most disconnected out of the 3 cities in Puno. Its position in the ranks since 1975 has fallen; relative to other cities in Puno, the street network in Ilave has become more connected. Ilave ranked 2nd in 1975, 3rd in 1976-1990, 3rd in 1991-2000 and 3rd in 2001-2014.

Ilave and Peru do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Ilave rose steadily, while the SNDi of street constructions in Peru was at its lowest in 1976-1990.

To date, Ilave is the 49th-most disconnected out of the 49 cities in Peru. Its position in the ranks since 1975 has fallen; relative to other cities in Peru, the street network in Ilave has become more connected. Ilave ranked 47th in 1975, 49th in 1976-1990, 49th in 1991-2000 and 49th in 2001-2014.

As of 2015, Ilave had a built-up area of 1.03 square kilometers, and a population of 55284 people.

These are some other cities with approximately the same population: