Fig. 3: Evolution of built-up land of 31 provincial capital cities (municipalities) in China from 2006 to 2020.

Figure illustrates the urban expansion rate and the changes in built-up land of 31 provincial capital cities (municipalities) in China from 2006 to 2020. The left vertical axis is the changes in built-up land, which is represented by circles, and the right vertical axis is the urban expansion rate, which is represented by bars.