Alabama: region in United States
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 Alabama, United States on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Alabama as of 2014, the overall level of street-network sprawl is 4.66, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 3.19, 5.19, 6.98 and 6.96. Street construction in Alabama increased in disconnectivity initially but has since improved. The streets constructed in 1991-2000 were the most disconnected.
Quantity of street network construction: The street network in Alabama spans a total of 119026 kilometers. The period with the greatest volume of street construction was 1975. These roads have an SNDi of 3.19, 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 3.19, 3.92, 4.34 and 4.66. Overall, the SNDi of the aggregate street network has risen: the street network in Alabama has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.74 points, but between 1991-2000 and 2001-2014, it rose by just 0.32.
The level of street-network sprawl in new development in Alabama peaked in 1991-2000. To get a sense of how street development has changed in Alabama, we can consider three of its most populous cities: Birmingham, Montgomery and Mobile. Out of the three cities, Birmingham and Montgomery do not follow the same trend as the region. The level of street-network sprawl in new development in Birmingham rose steadily. The level of street-network sprawl in new development in Montgomery rose steadily.
How do development practices in Alabama fare in comparison to others in United States? Most recently in 2001-2014, street construction in Alabama was the 8th-most disconnected out of the 46 regions in United States. Its position in the ranks since 1975 has risen; relative to other regions in United States, street construction in Alabama has become more disconnected. Alabama ranked 19th in 1975, 16th in 1976-1990, 10th in 1991-2000 and 8th in 2001-2014.
As of 2014, the city with the most disconnected street network in Alabama is Montgomery with an SNDi of 3.82, which is highly disconnected. Conversely, the most connected city is Mobile with an SNDi of 2.24, which is relatively well-connected. See trends for these cities: Mobile, Montgomery
The level of street-network sprawl in the aggregate network in Alabama rose steadily. To get a sense of how the aggregate street network has changed in Alabama, we can consider three of its most populous cities: Birmingham, Montgomery and Mobile. Disconnectivity in the most populous cities in Alabama follow the same region trend.
To date, Alabama is the 12th-most disconnected out of the 46 regions in United States. Its position in the ranks since 1975 has risen; relative to other regions in United States, the street network in Alabama has become more disconnected. Alabama ranked 19th in 1975, 18th in 1976-1990, 12th in 1991-2000 and 12th in 2001-2014.