Sanmenxia: city in Henan, 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 Sanmenxia, China on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Sanmenxia as of 2014, the overall level of street-network sprawl is 1.37, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 1.54, 1.38, 0.02 and 1.51. The disconnectivity of new streets constructed in Sanmenxia fell, then rose. In 1991-2000, new street layouts were the most connected.
Quantity of street network construction: The street network in Sanmenxia spans a total of 242 kilometers. The period with the greatest volume of street construction was 1975. These roads have an SNDi of 1.54, 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 1.54, 1.48, 1.37 and 1.37. The SNDi of the aggregate street network in fell at first, but Sanmenxia has worsened in disconnectivity since 2000.
Sanmenxia and Henan do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Sanmenxia was at its lowest in 1991-2000, while the SNDi of street constructions in Henan peaked in 1991-2000.
How do development practices in Sanmenxia fare in comparison to others in Henan? Most recently in 2001-2014, street construction in Sanmenxia was the 33rd-most disconnected out of the 118 cities in Henan. Its position in the ranks since 1975 has fallen; relative to other cities in Henan, street construction in Sanmenxia has become more connected. Sanmenxia ranked 23rd in 1975, 37th in 1976-1990, 72nd in 1991-2000 and 33rd in 2001-2014.
Sanmenxia and China do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Sanmenxia 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 Sanmenxia fare in comparison to others in China? Most recently in 2001-2014, street construction in Sanmenxia was the 854th-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 Sanmenxia has become more connected. Sanmenxia ranked 646th in 1975, 919th in 1976-1990, 1079th in 1991-2000 and 854th in 2001-2014.
Sanmenxia and Henan do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Sanmenxia was at its lowest in 1991-2000, while the SNDi of street constructions in Henan peaked in 1976-1990.
To date, Sanmenxia is the 36th-most disconnected out of the 118 cities in Henan. Its position in the ranks since 1975 has fallen; relative to other cities in Henan, the street network in Sanmenxia has become more connected. Sanmenxia ranked 23rd in 1975, 31st in 1976-1990, 39th in 1991-2000 and 36th in 2001-2014.
Sanmenxia and China do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Sanmenxia was at its lowest in 1991-2000, while the SNDi of street constructions in China peaked in 1976-1990.
To date, Sanmenxia is the 1027th-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 Sanmenxia has become more connected. Sanmenxia ranked 646th in 1975, 889th in 1976-1990, 971st in 1991-2000 and 1027th in 2001-2014.
As of 2015, Sanmenxia had a built-up area of 24.08 square kilometers, and a population of 288770 people.
These are some other cities with approximately the same population: