Henan: region in 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 Henan, China on the sprawlmap
Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Henan as of 2014, the overall level of street-network sprawl is 2.06, which is relatively well-connected.
Trends in street network construction: The SNDis of street construction for the respective time periods are 2.07, 2.09, 2.14 and 1.94. Street construction in Henan 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 Henan spans a total of 88783 kilometers. It is dominated by roads constructed in 2001-2014. These roads have an SNDi of 1.94, 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 2.07, 2.14, 2.13 and 2.06. The aggregate street network in Henan increased in disconnectivity initially,but the trend has turned around after 1990.
The level of street-network sprawl in new development in Henan peaked in 1991-2000. To get a sense of how street development has changed in Henan, we can consider three of its most populous cities: Zhengzhou, Luoyang and Anyang. Out of the three cities, Zhengzhou does not follow the same trend as the region. The level of street-network sprawl in new development in Zhengzhou was at its lowest in 1991-2000.
How do development practices in Henan fare in comparison to others in China? Most recently in 2001-2014, street construction in Henan was the 32nd-most disconnected out of the 34 regions in China. Its position in the ranks since 1975 has fallen; relative to other regions in China, street construction in Henan has become more connected. Henan ranked 26th in 1975, 32nd in 1976-1990, 29th in 1991-2000 and 32nd in 2001-2014.
As of 2014, the city with the most disconnected street network in Henan is Minggang with an SNDi of 4.61, which is highly disconnected. Conversely, the most connected city is Nanpu with an SNDi of -2.58, which is very well-connected. See trends for these cities: Nanpu, Minggang
The level of street-network sprawl in the aggregate network in Henan peaked in 1976-1990. To get a sense of how the aggregate street network has changed in Henan, we can consider three of its most populous cities: Zhengzhou, Luoyang and Anyang. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Zhengzhou was at its lowest in 1991-2000. The level of street-network sprawl in the aggregate network in Luoyang rose steadily. The level of street-network sprawl in the aggregate network in Anyang peaked in 1991-2000.
To date, Henan is the 31st-most disconnected out of the 34 regions in China. Its position in the ranks since 1975 has fallen; relative to other regions in China, the street network in Henan has become more connected. Henan ranked 26th in 1975, 30th in 1976-1990, 29th in 1991-2000 and 31st in 2001-2014.
- Lingbao
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