Tianjia‘an: city in Anhui, 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 Tianjia‘an, China on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Tianjia‘an as of 2014, the overall level of street-network sprawl is 4.82, which is highly disconnected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 4.39, 5.07, 3.19 and 3.96. Disconnectivity in street construction in Tianjia‘an follows a zig-zag trend. In 1991-2000, street construction was most disconnected, while construction was most connected in 1976-1990.
Quantity of street network construction: The street network in Tianjia‘an spans a total of 711 kilometers. It is dominated by roads constructed in 1976-1990. These roads have an SNDi of 5.07, 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 4.39, 4.94, 4.91 and 4.82. The aggregate street network in Tianjia‘an increased in disconnectivity initially,but the trend has turned around after 1990.
Tianjia‘an and Anhui do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Tianjia‘an followed a zig-zag trend with an overall decrease, while the SNDi of street constructions in Anhui fell steadily.
How do development practices in Tianjia‘an fare in comparison to others in Anhui? Most recently in 2001-2014, street construction in Tianjia‘an was the 1st-most disconnected out of the 65 cities in Anhui. Its position in the ranks since 1975 has risen; relative to other cities in Anhui, street construction in Tianjia‘an has become more disconnected. Tianjia‘an ranked 2nd in 1975, 1st in 1976-1990, 3rd in 1991-2000 and 1st in 2001-2014.
Tianjia‘an and China follow the same trend in the disconnectivity of their street network constructions. The SNDi for both of these followed a zig-zag trend with an overall decrease.
How do development practices in Tianjia‘an fare in comparison to others in China? Most recently in 2001-2014, street construction in Tianjia‘an was the 202nd-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 Tianjia‘an has become more connected. Tianjia‘an ranked 84th in 1975, 56th in 1976-1990, 214th in 1991-2000 and 202nd in 2001-2014.
Tianjia‘an and Anhui do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Tianjia‘an peaked in 1976-1990, while the SNDi of street constructions in Anhui fell steadily.
To date, Tianjia‘an is the 1st-most disconnected out of the 65 cities in Anhui. Its position in the ranks since 1975 has risen; relative to other cities in Anhui, the street network in Tianjia‘an has become more disconnected. Tianjia‘an ranked 2nd in 1975, 1st in 1976-1990, 1st in 1991-2000 and 1st in 2001-2014.
Tianjia‘an and China follow the same trend in the disconnectivity of their aggregate street networks. The SNDi for both of these peaked in 1976-1990.
To date, Tianjia‘an is the 50th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has risen; relative to other cities in China, the street network in Tianjia‘an has become more disconnected. Tianjia‘an ranked 84th in 1975, 44th in 1976-1990, 37th in 1991-2000 and 50th in 2001-2014.
As of 2015, Tianjia‘an had a built-up area of 104.55 square kilometers, and a population of 997914 people.
These are some other cities with approximately the same population: