Street-network Sprawl in 营城镇, 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.

营城镇: city in Tianjin, 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 营城镇, China on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in 营城镇 as of 2014, the overall level of street-network sprawl is 1.09, which is relatively well-connected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 1.0, 0.96, 2.28 and 1.18. Disconnectivity in street construction in 营城镇 follows a zig-zag trend. In 1976-1990, street construction was most disconnected, while construction was most connected in 1991-2000.

Quantity of street network construction: The street network in 营城镇 spans a total of 211 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 0.96, 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 1.0, 0.97, 1.06 and 1.09. The SNDi of the aggregate street network in fell at first, but 营城镇 has worsened in disconnectivity since 1990.

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

How do development practices in 营城镇 fare in comparison to others in Tianjin? Most recently in 2001-2014, street construction in 营城镇 was the 9th-most disconnected out of the 14 cities in Tianjin. Its position in the ranks since 1975 has fallen; relative to other cities in Tianjin, street construction in 营城镇 has become more connected. 营城镇 ranked 7th in 1975, 12th in 1976-1990, 6th in 1991-2000 and 9th in 2001-2014.

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

How do development practices in 营城镇 fare in comparison to others in China? Most recently in 2001-2014, street construction in 营城镇 was the 953rd-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 营城镇 has become more connected. 营城镇 ranked 828th in 1975, 1074th in 1976-1990, 410th in 1991-2000 and 953rd in 2001-2014.

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

To date, 营城镇 is the 12th-most disconnected out of the 14 cities in Tianjin. Its position in the ranks since 1975 has fallen; relative to other cities in Tianjin, the street network in 营城镇 has become more connected. 营城镇 ranked 7th in 1975, 12th in 1976-1990, 11th in 1991-2000 and 12th in 2001-2014.

营城镇 and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in 营城镇 was at its lowest in 1976-1990, while the SNDi of street constructions in China peaked in 1976-1990.

To date, 营城镇 is the 1168th-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 营城镇 has become more connected. 营城镇 ranked 828th in 1975, 1140th in 1976-1990, 1126th in 1991-2000 and 1168th in 2001-2014.

As of 2015, 营城镇 had a built-up area of 17.57 square kilometers, and a population of 185833 people.

These are some other cities with approximately the same population: