Sanmen: city in Zhejiang, 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 Sanmen, China on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Sanmen as of 2014, the overall level of street-network sprawl is 1.59, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are -1.65, 1.46, 0.18 and 3.5. Disconnectivity in street construction in Sanmen follows a zig-zag trend. In 1975, street construction was most disconnected, while construction was most connected in 2001-2014.
Quantity of street network construction: The street network in Sanmen spans a total of 91 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 3.5, 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 -1.65, 1.28, 0.9 and 1.59. Disconnectivity in Sanmen's street network follows a zig-zag trend. In 1975, the city was most disconnected; while it was most connected in 2001-2014.
Sanmen and Zhejiang do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Sanmen followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Zhejiang peaked in 1976-1990.
How do development practices in Sanmen fare in comparison to others in Zhejiang? Most recently in 2001-2014, street construction in Sanmen was the 14th-most disconnected out of the 94 cities in Zhejiang. Its position in the ranks since 1975 has risen; relative to other cities in Zhejiang, street construction in Sanmen has become more disconnected. Sanmen ranked 81st in 1975, 58th in 1976-1990, 68th in 1991-2000 and 14th in 2001-2014.
Sanmen 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 increase.
How do development practices in Sanmen fare in comparison to others in China? Most recently in 2001-2014, street construction in Sanmen was the 270th-most disconnected out of the 1651 cities in China. Its position in the ranks since 1975 has risen; relative to other cities in China, street construction in Sanmen has become more disconnected. Sanmen ranked 1295th in 1975, 892nd in 1976-1990, 1050th in 1991-2000 and 270th in 2001-2014.
Sanmen and Zhejiang do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Sanmen followed a zig-zag trend with an overall increase, while the SNDi of street constructions in Zhejiang peaked in 1976-1990.
To date, Sanmen is the 58th-most disconnected out of the 94 cities in Zhejiang. Its position in the ranks since 1975 has risen; relative to other cities in Zhejiang, the street network in Sanmen has become more disconnected. Sanmen ranked 81st in 1975, 71st in 1976-1990, 76th in 1991-2000 and 58th in 2001-2014.
Sanmen and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Sanmen followed a zig-zag trend with an overall increase, while the SNDi of street constructions in China peaked in 1976-1990.
To date, Sanmen is the 908th-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 Sanmen has become more disconnected. Sanmen ranked 1295th in 1975, 999th in 1976-1990, 1196th in 1991-2000 and 908th in 2001-2014.
As of 2015, Sanmen had a built-up area of 5.77 square kilometers, and a population of 62470 people.
These are some other cities with approximately the same population: