Street-network Sprawl in Laixi, 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.

Laixi: city in Shandong, 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 Laixi, China on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Laixi as of 2014, the overall level of street-network sprawl is -0.06, which is very well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are -1.11, 0.02, -0.83 and -0.0. Disconnectivity in street construction in Laixi follows a zig-zag trend. In 1975, street construction was most disconnected, while construction was most connected in 1976-1990.

Quantity of street network construction: The street network in Laixi spans a total of 297 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of -0.0, 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 -1.11, -0.02, -0.12 and -0.06. Disconnectivity in Laixi's street network follows a zig-zag trend. In 1975, the city was most disconnected; while it was most connected in 1976-1990.

Laixi and Shandong follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these followed a zig-zag trend with an overall increase.

How do development practices in Laixi fare in comparison to others in Shandong? Most recently in 2001-2014, street construction in Laixi was the 95th-most disconnected out of the 113 cities in Shandong. Its position in the ranks since 1975 has fallen; relative to other cities in Shandong, street construction in Laixi has become more connected. Laixi ranked 87th in 1975, 86th in 1976-1990, 102nd in 1991-2000 and 95th in 2001-2014.

Laixi and China follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these followed a zig-zag trend with an overall increase.

How do development practices in Laixi fare in comparison to others in China? Most recently in 2001-2014, street construction in Laixi was the 1288th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has fallen; relative to other cities in China, street construction in Laixi has become more connected. Laixi ranked 1272nd in 1975, 1357th in 1976-1990, 1228th in 1991-2000 and 1288th in 2001-2014.

Laixi and Shandong do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Laixi followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Shandong peaked in 1976-1990.

To date, Laixi is the 98th-most disconnected out of the 113 cities in Shandong. Its position in the ranks since 1975 has fallen; relative to other cities in Shandong, the street network in Laixi has become more connected. Laixi ranked 87th in 1975, 88th in 1976-1990, 98th in 1991-2000 and 98th in 2001-2014.

Laixi and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Laixi followed a zig-zag trend with an overall increase, while the SNDi of street constructions in China peaked in 1976-1990.

To date, Laixi is the 1571st-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has fallen; relative to other cities in China, the street network in Laixi has become more connected. Laixi ranked 1272nd in 1975, 1476th in 1976-1990, 1540th in 1991-2000 and 1571st in 2001-2014.

As of 2015, Laixi had a built-up area of 35.81 square kilometers, and a population of 220254 people.

These are some other cities with approximately the same population: