Street-network Sprawl in Linxia, China

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.

Linxia: city in Gansu, China

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 Linxia, China on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Linxia as of 2014, the overall level of street-network sprawl is 2.56, which is in the 40th to 60th percentile of disconnectedness.

Trends in street network construction: The SNDis of street construction for the respective time periods are 1.66, 2.27, 3.02 and 2.94. Street construction in Linxia increased in disconnectivity initially but has since improved. The streets constructed in 1991-2000 were the most disconnected.

Quantity of street network construction: The street network in Linxia spans a total of 228 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 2.94, which is in the 40th to 60th percentile of disconnectedness.

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 1.66, 2.17, 2.42 and 2.56. Overall, the SNDi of the aggregate street network has risen: the street network in Linxia has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.51 points, but between 1991-2000 and 2001-2014, it rose by just 0.14.

Linxia and Gansu do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Linxia peaked in 1991-2000, while the SNDi of street constructions in Gansu was at its lowest in 1991-2000.

How do development practices in Linxia fare in comparison to others in Gansu? Most recently in 2001-2014, street construction in Linxia was the 12th-most disconnected out of the 34 cities in Gansu. Its position in the ranks since 1975 has risen; relative to other cities in Gansu, street construction in Linxia has become more disconnected. Linxia ranked 16th in 1975, 18th in 1976-1990, 7th in 1991-2000 and 12th in 2001-2014.

Linxia and China do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Linxia peaked in 1991-2000, while the SNDi of street constructions in China followed a zig-zag trend with an overall decrease.

How do development practices in Linxia fare in comparison to others in China? Most recently in 2001-2014, street construction in Linxia was the 395th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has risen; relative to other cities in China, street construction in Linxia has become more disconnected. Linxia ranked 600th in 1975, 545th in 1976-1990, 241st in 1991-2000 and 395th in 2001-2014.

Linxia and Gansu do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Linxia rose steadily, while the SNDi of street constructions in Gansu fell steadily.

To date, Linxia is the 16th-most disconnected out of the 34 cities in Gansu. Its position in the ranks since 1975 has not changed. Linxia ranked 16th in 1975, 21st in 1976-1990, 16th in 1991-2000 and 16th in 2001-2014.

Linxia and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Linxia rose steadily, while the SNDi of street constructions in China peaked in 1976-1990.

To date, Linxia is the 447th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has risen; relative to other cities in China, the street network in Linxia has become more disconnected. Linxia ranked 600th in 1975, 577th in 1976-1990, 468th in 1991-2000 and 447th in 2001-2014.

As of 2015, Linxia had a built-up area of 10.14 square kilometers, and a population of 240669 people.

These are some other cities with approximately the same population: