Auvergne-Rhône-Alpes: region in France
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 Auvergne-Rhône-Alpes, France on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Auvergne-Rhône-Alpes as of 2014, the overall level of street-network sprawl is 3.73, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 2.77, 4.36, 5.12 and 5.06. Street construction in Auvergne-Rhône-Alpes 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 Auvergne-Rhône-Alpes spans a total of 148705 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 4.36, which is highly disconnected.
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 2.77, 3.51, 3.64 and 3.73. Overall, the SNDi of the aggregate street network has risen: the street network in Auvergne-Rhône-Alpes has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.75 points, but between 1991-2000 and 2001-2014, it rose by just 0.09.
The level of street-network sprawl in new development in Auvergne-Rhône-Alpes peaked in 1991-2000. To get a sense of how street development has changed in Auvergne-Rhône-Alpes, we can consider three of its most populous cities: Lyon, Grenoble and Clermont-Ferrand. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Lyon followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Grenoble followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Clermont-Ferrand rose steadily.
How do development practices in Auvergne-Rhône-Alpes fare in comparison to others in France? Most recently in 2001-2014, street construction in Auvergne-Rhône-Alpes was the 10th-most disconnected out of the 20 regions in France. Its position in the ranks since 1975 has not changed. Auvergne-Rhône-Alpes ranked 10th in 1975, 5th in 1976-1990, 6th in 1991-2000 and 10th in 2001-2014.
As of 2014, the city with the most disconnected street network in Auvergne-Rhône-Alpes is Annecy with an SNDi of 2.88, which is in the 40th to 60th percentile of disconnectedness. Conversely, the most connected city is Grenoble with an SNDi of 1.92, which is relatively well-connected. See trends for these cities: Grenoble, Annecy
The level of street-network sprawl in the aggregate network in Auvergne-Rhône-Alpes rose steadily. To get a sense of how the aggregate street network has changed in Auvergne-Rhône-Alpes, we can consider three of its most populous cities: Lyon, Grenoble and Clermont-Ferrand. Disconnectivity in the most populous cities in Auvergne-Rhône-Alpes follow the same region trend.
To date, Auvergne-Rhône-Alpes is the 10th-most disconnected out of the 20 regions in France. Its position in the ranks since 1975 has not changed. Auvergne-Rhône-Alpes ranked 10th in 1975, 10th in 1976-1990, 10th in 1991-2000 and 10th in 2001-2014.