Qin'an: city in Gansu, China
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 Qin'an, China on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Qin'an as of 2014, the overall level of street-network sprawl is 3.51, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 4.47, 3.28, 3.22 and 4.21. The disconnectivity of new streets constructed in Qin'an fell, then rose. In 1991-2000, new street layouts were the most connected.
Quantity of street network construction: The street network in Qin'an spans a total of 140 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 3.28, 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 4.47, 3.62, 3.52 and 3.51. Overall, the SNDi of the aggregate street network has fallen: the street network in Qin'an has become more connected.
Qin'an and Gansu follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these was at its lowest in 1991-2000.
How do development practices in Qin'an fare in comparison to others in Gansu? Most recently in 2001-2014, street construction in Qin'an was the 6th-most disconnected out of the 34 cities in Gansu. Its position in the ranks since 1975 has fallen; relative to other cities in Gansu, street construction in Qin'an has become more connected. Qin'an ranked 2nd in 1975, 12th in 1976-1990, 6th in 1991-2000 and 6th in 2001-2014.
Qin'an and China do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Qin'an was at its lowest in 1991-2000, while the SNDi of street constructions in China followed a zig-zag trend with an overall decrease.
How do development practices in Qin'an fare in comparison to others in China? Most recently in 2001-2014, street construction in Qin'an was the 169th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has fallen; relative to other cities in China, street construction in Qin'an has become more connected. Qin'an ranked 80th in 1975, 248th in 1976-1990, 211th in 1991-2000 and 169th in 2001-2014.
Qin'an and Gansu follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these fell steadily.
To date, Qin'an is the 11th-most disconnected out of the 34 cities in Gansu. Its position in the ranks since 1975 has fallen; relative to other cities in Gansu, the street network in Qin'an has become more connected. Qin'an ranked 2nd in 1975, 9th in 1976-1990, 9th in 1991-2000 and 11th in 2001-2014.
Qin'an and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Qin'an fell steadily, while the SNDi of street constructions in China peaked in 1976-1990.
To date, Qin'an is the 170th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has fallen; relative to other cities in China, the street network in Qin'an has become more connected. Qin'an ranked 80th in 1975, 152nd in 1976-1990, 153rd in 1991-2000 and 170th in 2001-2014.
As of 2015, Qin'an had a built-up area of 6.07 square kilometers, and a population of 103310 people.
These are some other cities with approximately the same population: