Street-network Sprawl in Nagercoil, India

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.

Nagercoil: city in Tamil Nadu, India

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 Nagercoil, India on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Nagercoil as of 2014, the overall level of street-network sprawl is 3.19, 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 5.07, 4.24, 3.64 and 2.59. In each period, new street development in Nagercoil steadily grows more connected than in the last. This decrease has quickened: between 1975 and 1976-1990, SNDi fell by 0.83 points, but between 1991-2000 and 2001-2014, it fell by just 1.05.

Quantity of street network construction: The street network in Nagercoil spans a total of 278 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 2.59, 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 5.07, 4.56, 4.41 and 3.19. Overall, the SNDi of the aggregate street network has fallen: the street network in Nagercoil has become more connected. This decrease has quickened: between 1975 and 1976-1990, SNDi fell by 0.51 points, but between 1991-2000 and 2001-2014, it fell by just 1.22.

Nagercoil and Tamil Nadu do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Nagercoil fell steadily, while the SNDi of street constructions in Tamil Nadu rose steadily.

How do development practices in Nagercoil fare in comparison to others in Tamil Nadu? Most recently in 2001-2014, street construction in Nagercoil was the 97th-most disconnected out of the 151 cities in Tamil Nadu. Its position in the ranks since 1975 has fallen; relative to other cities in Tamil Nadu, street construction in Nagercoil has become more connected. Nagercoil ranked 12th in 1975, 11th in 1976-1990, 51st in 1991-2000 and 97th in 2001-2014.

Nagercoil and India do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Nagercoil fell steadily, while the SNDi of street constructions in India rose steadily.

How do development practices in Nagercoil fare in comparison to others in India? Most recently in 2001-2014, street construction in Nagercoil was the 767th-most disconnected out of the 1716 cities in India. Its position in the ranks since 1975 has fallen; relative to other cities in India, street construction in Nagercoil has become more connected. Nagercoil ranked 78th in 1975, 185th in 1976-1990, 396th in 1991-2000 and 767th in 2001-2014.

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

To date, Nagercoil is the 56th-most disconnected out of the 151 cities in Tamil Nadu. Its position in the ranks since 1975 has fallen; relative to other cities in Tamil Nadu, the street network in Nagercoil has become more connected. Nagercoil ranked 12th in 1975, 13th in 1976-1990, 15th in 1991-2000 and 56th in 2001-2014.

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

To date, Nagercoil is the 565th-most disconnected out of the 1716 cities in India. Its position in the ranks since 1975 has fallen; relative to other cities in India, the street network in Nagercoil has become more connected. Nagercoil ranked 78th in 1975, 130th in 1976-1990, 176th in 1991-2000 and 565th in 2001-2014.

As of 2015, Nagercoil had a built-up area of 5.15 square kilometers, and a population of 364530 people.

These are some other cities with approximately the same population: