Street-network Sprawl in Santander, Spain

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.

Santander: city in Cantabria, Spain

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 Santander, Spain on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Santander as of 2014, the overall level of street-network sprawl is 1.94, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 1.68, 2.91, 3.61 and 4.23. In each period, new street development in Santander steadily grows more disconnected than in the last. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 1.22 points, but between 1991-2000 and 2001-2014, it rose by just 0.62.

Quantity of street network construction: The street network in Santander spans a total of 663 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 1.68, 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 1.68, 1.93, 1.94 and 1.94. Overall, the SNDi of the aggregate street network has risen: the street network in Santander has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.25 points, but between 1991-2000 and 2001-2014, it rose by just 0.0.

Santander and Cantabria follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these rose steadily.

How do development practices in Santander fare in comparison to others in Cantabria? Most recently in 2001-2014, street construction in Santander was the 1st-most disconnected out of the 2 cities in Cantabria. Its position in the ranks since 1975 has not changed. Santander ranked 1st in 1975, 1st in 1976-1990, 1st in 1991-2000 and 1st in 2001-2014.

Santander and Spain do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Santander rose steadily, while the SNDi of street constructions in Spain peaked in 1991-2000.

How do development practices in Santander fare in comparison to others in Spain? Most recently in 2001-2014, street construction in Santander was the 7th-most disconnected out of the 72 cities in Spain. Its position in the ranks since 1975 has risen; relative to other cities in Spain, street construction in Santander has become more disconnected. Santander ranked 13th in 1975, 15th in 1976-1990, 14th in 1991-2000 and 7th in 2001-2014.

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

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

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

To date, Santander is the 12th-most disconnected out of the 72 cities in Spain. Its position in the ranks since 1975 has risen; relative to other cities in Spain, the street network in Santander has become more disconnected. Santander ranked 13th in 1975, 11th in 1976-1990, 11th in 1991-2000 and 12th in 2001-2014.

As of 2015, Santander had a built-up area of 25.07 square kilometers, and a population of 206816 people.

These are some other cities with approximately the same population: