Fig. 6

Spatial evolution of the CCD in 2008, 2011, 2014, 2017, and 2021. Notes: ① Source: Authors’ own drawing, based on GeoDa 1.22.0.4 software. ② The map of China includes Tibet, Hong Kong, Macau, Taiwan, and the Nansha Islands. These areas are not included in the study data, so the value of (0, 0.1] needs to be subtracted by 5.