The built-up area refers to the non-agricultural production and construction section in the city administrative area which has been expropriated and the actual construction. It includes the urban concentrated contiguous part and the scattered suburban area and the city has the close relation, has the basic consummation municipal public Facilities such as airports, railway marshalling stations, sewage treatment plants, communication stations, etc.
Built-up area, generally refers to the built-up area can be included in the contour area, which is the actual construction of the city to reach the realm of land, therefore, it is a closed whole area, a city of scattered towns , Its built-up area may be composed of several corresponding closed areas.
Data show that from 1990 to 2000, China's urban built-up area from 12,200 square kilometers to 21,800 square kilometers, an increase of 78.3%; by 2010, this figure reached 40,500 square kilometers, an increase of 85.5%. In terms of multiples, 2010 was more than double that of 1990.
Source: Atlas of China's Natural Disaster System
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