Street-network Sprawl in Petit-Goâve, Haiti

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.

Petit-Goâve: city in Ouest, Haiti

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 Petit-Goâve, Haiti on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Petit-Goâve as of 2014, the overall level of street-network sprawl is 2.8, 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 -0.6, 1.54, 3.51 and 9.29. In each period, new street development in Petit-Goâve steadily grows more disconnected than in the last.

Quantity of street network construction: The street network in Petit-Goâve spans a total of 70 kilometers. The period with the greatest volume of street construction was 1976-1990. These roads have an SNDi of 1.54, 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 -0.6, 1.42, 2.59 and 2.8. Overall, the SNDi of the aggregate street network has risen: the street network in Petit-Goâve has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 2.02 points, but between 1991-2000 and 2001-2014, it rose by just 0.21.

Petit-Goâve and Ouest do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Petit-Goâve rose steadily, while the SNDi of street constructions in Ouest peaked in 1991-2000.

How do development practices in Petit-Goâve fare in comparison to others in Ouest? Most recently in 2001-2014, street construction in Petit-Goâve was the 1st-most disconnected out of the 6 cities in Ouest. Its position in the ranks since 1975 has risen; relative to other cities in Ouest, street construction in Petit-Goâve has become more disconnected. Petit-Goâve ranked 5th in 1975, 5th in 1976-1990, 4th in 1991-2000 and 1st in 2001-2014.

Petit-Goâve and Haiti do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Petit-Goâve rose steadily, while the SNDi of street constructions in Haiti peaked in 1991-2000.

How do development practices in Petit-Goâve fare in comparison to others in Haiti? Most recently in 2001-2014, street construction in Petit-Goâve was the 1st-most disconnected out of the 22 cities in Haiti. Its position in the ranks since 1975 has risen; relative to other cities in Haiti, street construction in Petit-Goâve has become more disconnected. Petit-Goâve ranked 19th in 1975, 13th in 1976-1990, 8th in 1991-2000 and 1st in 2001-2014.

Petit-Goâve and Ouest do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Petit-Goâve rose steadily, while the SNDi of street constructions in Ouest peaked in 1991-2000.

To date, Petit-Goâve is the 4th-most disconnected out of the 6 cities in Ouest. Its position in the ranks since 1975 has risen; relative to other cities in Ouest, the street network in Petit-Goâve has become more disconnected. Petit-Goâve ranked 5th in 1975, 5th in 1976-1990, 5th in 1991-2000 and 4th in 2001-2014.

Petit-Goâve and Haiti follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.

To date, Petit-Goâve is the 10th-most disconnected out of the 22 cities in Haiti. Its position in the ranks since 1975 has risen; relative to other cities in Haiti, the street network in Petit-Goâve has become more disconnected. Petit-Goâve ranked 19th in 1975, 17th in 1976-1990, 11th in 1991-2000 and 10th in 2001-2014.

As of 2015, Petit-Goâve had a built-up area of 3.18 square kilometers, and a population of 159797 people.

These are some other cities with approximately the same population: