Urban Expansion Analysis of China’s Prefecture Level City from 2000 to 2016 using High-Precision Urban Boundary

Urban boundary is the first important indicator for urban expansion analysis. However, little attention has been paid to reveal urban expansion with urban boundary at large region scale due to lacking high-precision and consistent urban boundaries. In this study, high-precision urban boundaries of China’s 337 prefecture level cities from 2000 to 2016 were extracted by using high-resolution images and a series of geographic rules. Analysis results showed that (1) China had undergone a rapid urbanization with the urban area increased by 122.6% from 2000 to 2016. (2) 73.3% of the 337 cities had the urban expansion form of edge-expansion (3) Urban expansion was not coordinated with urban population growth. Urban expansion rate of 24 provinces was ahead of urban population growth rate. 4) The two major land source of urban expansion areas was cultivated land and construction land, which was 56.4% and 23.9% of the total urban expansion area respectively.

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