Bologna: city in Emilia-Romagna, Italy
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 Bologna, Italy on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Bologna as of 2014, the overall level of street-network sprawl is 1.73, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 1.33, 2.93, 5.06 and 3.68. Street construction in Bologna 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 Bologna spans a total of 1087 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 1.33, 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 1.33, 1.67, 1.7 and 1.73. Overall, the SNDi of the aggregate street network has risen: the street network in Bologna has become more disconnected. This increase has slowed: between 1975 and 1976-1990, SNDi rose by 0.33 points, but between 1991-2000 and 2001-2014, it rose by just 0.03.
Bologna and Emilia-Romagna follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these peaked in 1991-2000.
How do development practices in Bologna fare in comparison to others in Emilia-Romagna? Most recently in 2001-2014, street construction in Bologna was the 5th-most disconnected out of the 9 cities in Emilia-Romagna. Its position in the ranks since 1975 has risen; relative to other cities in Emilia-Romagna, street construction in Bologna has become more disconnected. Bologna ranked 8th in 1975, 3rd in 1976-1990, 1st in 1991-2000 and 5th in 2001-2014.
Bologna and Italy follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these peaked in 1991-2000.
How do development practices in Bologna fare in comparison to others in Italy? Most recently in 2001-2014, street construction in Bologna was the 44th-most disconnected out of the 91 cities in Italy. Its position in the ranks since 1975 has risen; relative to other cities in Italy, street construction in Bologna has become more disconnected. Bologna ranked 60th in 1975, 51st in 1976-1990, 19th in 1991-2000 and 44th in 2001-2014.
Bologna and Emilia-Romagna follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.
To date, Bologna is the 7th-most disconnected out of the 9 cities in Emilia-Romagna. Its position in the ranks since 1975 has risen; relative to other cities in Emilia-Romagna, the street network in Bologna has become more disconnected. Bologna ranked 8th in 1975, 7th in 1976-1990, 7th in 1991-2000 and 7th in 2001-2014.
Bologna and Italy follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these rose steadily.
To date, Bologna is the 59th-most disconnected out of the 91 cities in Italy. Its position in the ranks since 1975 has risen; relative to other cities in Italy, the street network in Bologna has become more disconnected. Bologna ranked 60th in 1975, 60th in 1976-1990, 59th in 1991-2000 and 59th in 2001-2014.
As of 2015, Bologna had a built-up area of 40.35 square kilometers, and a population of 421341 people.
These are some other cities with approximately the same population: