Sarnia: city in Ontario, Canada
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 Sarnia, Canada on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Sarnia as of 2014, the overall level of street-network sprawl is 2.17, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 1.5, 2.74, 6.33 and 7.69. In each period, new street development in Sarnia steadily grows more disconnected than in the last.
Quantity of street network construction: The street network in Sarnia spans a total of 747 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 2.74, 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 1.5, 2.08, 2.14 and 2.17. Overall, the SNDi of the aggregate street network has risen: the street network in Sarnia has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.58 points, but between 1991-2000 and 2001-2014, it rose by just 0.03.
Sarnia and Ontario do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Sarnia rose steadily, while the SNDi of street constructions in Ontario peaked in 1991-2000.
How do development practices in Sarnia fare in comparison to others in Ontario? Most recently in 2001-2014, street construction in Sarnia was the 1st-most disconnected out of the 20 cities in Ontario. Its position in the ranks since 1975 has risen; relative to other cities in Ontario, street construction in Sarnia has become more disconnected. Sarnia ranked 15th in 1975, 13th in 1976-1990, 2nd in 1991-2000 and 1st in 2001-2014.
Sarnia and Canada follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these rose steadily.
How do development practices in Sarnia fare in comparison to others in Canada? Most recently in 2001-2014, street construction in Sarnia was the 1st-most disconnected out of the 48 cities in Canada. Its position in the ranks since 1975 has risen; relative to other cities in Canada, street construction in Sarnia has become more disconnected. Sarnia ranked 35th in 1975, 33rd in 1976-1990, 2nd in 1991-2000 and 1st in 2001-2014.
Sarnia and Ontario follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.
To date, Sarnia is the 8th-most disconnected out of the 20 cities in Ontario. Its position in the ranks since 1975 has risen; relative to other cities in Ontario, the street network in Sarnia has become more disconnected. Sarnia ranked 15th in 1975, 10th in 1976-1990, 8th in 1991-2000 and 8th in 2001-2014.
Sarnia and Canada follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.
To date, Sarnia is the 24th-most disconnected out of the 48 cities in Canada. Its position in the ranks since 1975 has risen; relative to other cities in Canada, the street network in Sarnia has become more disconnected. Sarnia ranked 35th in 1975, 26th in 1976-1990, 23rd in 1991-2000 and 24th in 2001-2014.
As of 2015, Sarnia had a built-up area of 61.77 square kilometers, and a population of 95048 people.
These are some other cities with approximately the same population: