Landscape metrics	Formula	Decription
PD	$P D = \frac{N}{A} (10, 000) (100)$	The number of patches per unit area of a certain type; Positive correlation with fragmentation degree; Where N is the number of landscape patches and A is the total area of the landscape, the same below.
ED	$E D = \frac{E}{A} 10^{6}$	Length of Patch Boundary in Unit Area; Where E is the total length of the boundary in the landscape, the same below.
LSI	$L S I = \frac{0.25 E}{\sqrt{A}}$	Reflecting the development degree of landscape types.
CONTAG	$C O N T A G = [1 + \frac{\sum_{i = 1}^{m} \sum_{i = 1}^{m} [p_{i} (\frac{g_{i k}}{\sum_{i = 1}^{m} g_{i k}})] \times [I n (p_{i}) (\frac{g_{i k}}{\sum_{i = 1}^{m} g_{i k}})]}{2 I n (m)}] \times 100$	Aggregation degree or extension trend of different landscape types; Where p_i is the area percentage of patch type i, g_ij is the number of adjacent patches between patch type i and patch type j, m is the total number of patch types, the same below.
SHDI	$S H D I = - \sum_{i = 1}^{m} [p_{i} \times I n (p_{i})]$	Indicators reflecting the diversity of landscape types.
SHEI	$S H E I = \frac{- \sum_{i = 1}^{m} [p_{i} \times I n (p_{i})]}{I n m}$	The SHEI value tends to be 1, indicating that the dominance is decreasing.