Ecological Security Assessment Based on Remote Sensing and Landscape Ecology Model

Table 1

Selected landscape metrics.

Landscape index	Meaning and value range
PLAND	The proportion of each patch area to the total area (0,100] [19, 34]
LPI	The largest patch area accounts for the proportion of the total area. The change of this value reflects the strength of human activities. It determines the abundance of dominant species in the landscape and helps determine dominant types (0,100] [35]
PAFRAC	Reflect the complexity of the shape of the landscape type on a specific scale [1,2] [36]
LSI	The degree of aggregation of patch shape features, indicating the shape of landscape [37]
CONTAG	The aggregation degree or spreading trend of different patch types in the landscape (0,100] [38]
IJI	Certain types of landscape adjacent to landscape types (0,100] [39]
SHDI	The degree of diversification of landscape types indicates the heterogeneity of the landscape and is more sensitive to the uneven distribution of various patch types, SHDI equal or greater than 0 [36, 40]
SHEI	There are no dominant types in the landscape, and the types are evenly distributed, indicating landscape diversity [0,1] [34]