Street-network Sprawl in Selong, Indonesia

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.

Selong: city in Nusa Tenggara Barat, Indonesia

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 Selong, Indonesia on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Selong as of 2014, the overall level of street-network sprawl is 3.52, which is highly disconnected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 2.48, nan, 4.0 and 4.7. Data was not available in 1976-1990.

Quantity of street network construction: The street network in Selong spans a total of 642 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 4.7, which is highly disconnected.

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 2.48, 2.48, 2.85 and 3.52. Overall, the SNDi of the aggregate street network has risen: the street network in Selong has become more disconnected.

Selong and Nusa Tenggara Barat 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 Nusa Tenggara Barat was at its lowest in 1976-1990.

How do development practices in Selong fare in comparison to others in Nusa Tenggara Barat? Most recently in 2001-2014, street construction in Selong was the 5th-most disconnected out of the 10 cities in Nusa Tenggara Barat. Its position in the ranks since 1975 has fallen; relative to other cities in Nusa Tenggara Barat, street construction in Selong has become more connected. Selong ranked 7th in 1975, 4th in 1991-2000 and 5th in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

Selong and Indonesia 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 Indonesia followed a zig-zag trend with an overall increase.

How do development practices in Selong fare in comparison to others in Indonesia? Most recently in 2001-2014, street construction in Selong was the 123rd-most disconnected out of the 363 cities in Indonesia. Its position in the ranks since 1975 has risen; relative to other cities in Indonesia, street construction in Selong has become more disconnected. Selong ranked 176th in 1975, 137th in 1991-2000 and 123rd in 2001-2014. There was no ranking in 1976-1990 due to unavailable data.

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

To date, Selong is the 4th-most disconnected out of the 10 cities in Nusa Tenggara Barat. Its position in the ranks since 1975 has risen; relative to other cities in Nusa Tenggara Barat, the street network in Selong has become more disconnected. Selong ranked 7th in 1975, 7th in 1976-1990, 5th in 1991-2000 and 4th in 2001-2014.

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

To date, Selong is the 162nd-most disconnected out of the 363 cities in Indonesia. Its position in the ranks since 1975 has risen; relative to other cities in Indonesia, the street network in Selong has become more disconnected. Selong ranked 176th in 1975, 223rd in 1976-1990, 209th in 1991-2000 and 162nd in 2001-2014.

As of 2015, Selong had a built-up area of 16.74 square kilometers, and a population of 420431 people.

These are some other cities with approximately the same population: