Coupling Coordinated Evolution and Forecast of Tourism-Urbanization-Ecological Environment: The Case Study of Chongqing, China

Table 3

Coordinated development level evaluation criteria.

Coordination state	D value	Description	Types
Serious imbalance	0 < D ≤ 0.2	The nexus between the three systems is extremely poor	Imbalance decay type
Imbalance	0.2 < D ≤ 0.4	The interaction between the three systems is weak
Endangered	0.4 < D ≤ 0.5	The interaction between the three systems is slightly increased	Intermediate transition type
Little coordination	0.5 < D ≤ 0.6	The relationship between the three systems is slightly coordinated
Coordination	0.6 < D ≤ 0.8	The relationship between the three systems is coordinated	Coordination promotion type
Good coordination	0.8 < D ≤ 1	The coordination between the three systems is extremely good