Street-network Sprawl in Huinong, 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.

Huinong: city in Ningxia Hui, 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 Huinong, China on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Huinong as of 2014, the overall level of street-network sprawl is -0.32, which is very well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 0.45, -0.49, 0.83 and -1.13. Disconnectivity in street construction in Huinong follows a zig-zag trend. In 2001-2014, street construction was most disconnected, while construction was most connected in 1991-2000.

Quantity of street network construction: The street network in Huinong spans a total of 55 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of -1.13, 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 0.45, -0.11, -0.06 and -0.32. Disconnectivity in Huinong's street network follows a zig-zag trend. In 2001-2014, the city was most disconnected; while it was most connected in 1975.

Huinong and Ningxia Hui do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Huinong followed a zig-zag trend with an overall decrease, while the SNDi of street constructions in Ningxia Hui peaked in 1976-1990.

How do development practices in Huinong fare in comparison to others in Ningxia Hui? Most recently in 2001-2014, street construction in Huinong was the 15th-most disconnected out of the 15 cities in Ningxia Hui. Its position in the ranks since 1975 has fallen; relative to other cities in Ningxia Hui, street construction in Huinong has become more connected. Huinong ranked 2nd in 1975, 13th in 1976-1990, 4th in 1991-2000 and 15th in 2001-2014.

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

How do development practices in Huinong fare in comparison to others in China? Most recently in 2001-2014, street construction in Huinong was the 1400th-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 Huinong has become more connected. Huinong ranked 1010th in 1975, 1439th in 1976-1990, 856th in 1991-2000 and 1400th in 2001-2014.

Huinong and Ningxia Hui do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Huinong followed a zig-zag trend with an overall decrease, while the SNDi of street constructions in Ningxia Hui peaked in 1991-2000.

To date, Huinong is the 13th-most disconnected out of the 15 cities in Ningxia Hui. Its position in the ranks since 1975 has fallen; relative to other cities in Ningxia Hui, the street network in Huinong has become more connected. Huinong ranked 2nd in 1975, 11th in 1976-1990, 10th in 1991-2000 and 13th in 2001-2014.

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

To date, Huinong is the 1606th-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 Huinong has become more connected. Huinong ranked 1010th in 1975, 1494th in 1976-1990, 1522nd in 1991-2000 and 1606th in 2001-2014.

As of 2015, Huinong had a built-up area of 3.24 square kilometers, and a population of 79876 people.

These are some other cities with approximately the same population: