Landscape metrics

Formula

Decription

PD

P D = 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 = 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 = 0.25 E A

Reflecting the development degree of landscape types.

CONTAG

C O N T A G = [ 1 + i = 1 m i = 1 m [ p i ( g i k i = 1 m g i k ) ] × [ I n ( p i ) ( g i k i = 1 m g i k ) ] 2 I n ( m ) ] × 100

Aggregation degree or extension trend of different landscape types; Where pi is the area percentage of patch type i, gij 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 = i = 1 m [ p i × I n ( p i ) ]

Indicators reflecting the diversity of landscape types.

SHEI

S H E I = i = 1 m [ p i × I n ( p i ) ] I n m

The SHEI value tends to be 1, indicating that the dominance is decreasing.