Table 1.

List of evaluation indicators for land cover status and change.

Evaluation Content	Indicators	Indicator Meaning	Formula *
Land cover condition	Composition pattern of land cover types	The area proportion of every land cover type calculated by the land cover map of 2020.	$P_i=\frac{S_i}{S}\ast 100\%$
Land cover change	Area change rate of land cover types	The area change of all land cover types from 2016 to 2020.	$E_i=\frac{S_{i,2020}-S_{i,2016}}{S_{i,2016}}\ast 100\%$
Mutual transformation characteristics between various land cover types	Transformation trend of land cover types	The transition matrix of land cover types between 2016 and 2020.	$\left\{\begin{array}{c}{PA}_{ab}=\frac{S_{ab}}{{\sum }_{b=1}^n{S}_{ab}}\ast 100\%\\ {PB}_{ab}=\frac{S_{ab}}{{\sum }_{b=1}^n{S}_{ab}}\ast 100\%\end{array}\right.$

*: $P_i$ is the area proportion of the i type of land cover map of 2020; $S_i$ is the area of the i type of land cover map of 2020; $S$ is the total area; $E_i$ is the area change rate of the i type during the evaluation period; $S_{i,2016}$ is the area of i type at 2016; $S_{i,2020}$ is the area of i type at 2020; a is the land cover type of 2016, b is the land cover type of 2020, $S_{ab}$ is the area of land cover type, ${PA}_{ab}$ is the proportion of the transformation from the a type in 2016 to the b type in 2020. ${PB}_{ab}$ is the proportion of b type in 2020 transformed from a type in 2016.